diff --git a/CHANGELOG.md b/CHANGELOG.md
index 211b50e760..c5da183949 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Fix bidirectional `FocusZone` to land focus correctly on DOWN key press after series of UP arrow keys @sophieH29 ([#1794](https://github.com/stardust-ui/react/pull/1794))
 - Fix `hand` icon in Teams theme @lucivpav ([#1782](https://github.com/stardust-ui/react/pull/1782))
 - ESC key should close the last opened `Popup` or `Dialog` if body has focus @sophieH29 ([#1807](https://github.com/stardust-ui/react/pull/1807))
+- Correctly define current document object of the `FocusZone` and `FocusTrapZone` @sophieH29 ([#1820](https://github.com/stardust-ui/react/pull/1820))
 
 ### Features
 - Add `overwrite` prop to `Provider` @layershifter ([#1780](https://github.com/stardust-ui/react/pull/1780))
diff --git a/packages/react/src/lib/accessibility/FocusZone/CHANGELOG.md b/packages/react/src/lib/accessibility/FocusZone/CHANGELOG.md
index 0fb1399ad3..aee15d24f4 100644
--- a/packages/react/src/lib/accessibility/FocusZone/CHANGELOG.md
+++ b/packages/react/src/lib/accessibility/FocusZone/CHANGELOG.md
@@ -13,6 +13,7 @@ This is a list of changes made to this Stardust copy of FocusZone in comparison
 - Update tabindexes and focus alignment when item is focused programatically @sophieH29 ([#1098](https://github.com/stardust-ui/react/pull/1098))
 - `FocusZone` should respect elements with `contenteditable` attribute on Home/End key press @sophieH29 ([#1749](https://github.com/stardust-ui/react/pull/1749))
 - Fix bidirectional `FocusZone` to land focus correctly on DOWN key press after series of UP arrow keys @sophieH29 ([#1794](https://github.com/stardust-ui/react/pull/1794))
+- Use always `getDocument` to correctly define current document object @sophieH29 ([#1820](https://github.com/stardust-ui/react/pull/1820))
 
 ### Features
 - Add embed mode for FocusZone and new Chat behavior ([#233](https://github.com/stardust-ui/react/pull/233))
@@ -68,12 +69,13 @@ This is a list of changes made to the Stardust copy of FocusTrapZone in comparis
 ### BREAKING CHANGES
 - Allow using `firstFocusableSelector` for all type of selectors, not only class names @sophieH29 ([#1732](https://github.com/stardust-ui/react/pull/1732))
 
-### fixes
+### Fixes
 - Do not focus trigger on outside click @sophieH29 ([#627](https://github.com/stardust-ui/react/pull/627))
 - Do not hide aria-live regions from accessibility tree @sophieH29 ([#917](https://github.com/stardust-ui/react/pull/917))
 - Do not propagate any keyboard events @sophieH29 ([#1180](https://github.com/stardust-ui/react/pull/1180))
+- Use always `getDocument` to correctly define current document object @sophieH29 ([#1820](https://github.com/stardust-ui/react/pull/1820))
 
-### features
+### Features
 - Add focus trap zone [#239](https://github.com/stardust-ui/react/pull/239)
     - Used Stardust utils instead of Fabric utilities:
     - Used `EventListener` [#949](https://github.com/stardust-ui/react/pull/949)
diff --git a/packages/react/src/lib/accessibility/FocusZone/FocusTrapZone.tsx b/packages/react/src/lib/accessibility/FocusZone/FocusTrapZone.tsx
index 97ecefb377..1a94b337b0 100644
--- a/packages/react/src/lib/accessibility/FocusZone/FocusTrapZone.tsx
+++ b/packages/react/src/lib/accessibility/FocusZone/FocusTrapZone.tsx
@@ -9,6 +9,7 @@ import {
   getFirstTabbable,
   getLastTabbable,
   getWindow,
+  getDocument,
   focusAsync,
   HIDDEN_FROM_ACC_TREE,
 } from './focusUtilities'
@@ -74,7 +75,8 @@ export default class FocusTrapZone extends React.Component<FocusTrapZoneProps, {
       forceFocusInsideTrapOnOutsideFocus,
       disabled,
     } = this.props
-    const activeElement = document.activeElement as HTMLElement
+    const doc = getDocument(this._root.current)
+    const activeElement = doc.activeElement as HTMLElement
 
     // if after componentDidUpdate focus is not inside the focus trap, bring it back
     if (
@@ -111,10 +113,11 @@ export default class FocusTrapZone extends React.Component<FocusTrapZoneProps, {
 
   componentWillUnmount(): void {
     // don't handle return focus unless forceFocusInsideTrapOnOutsideFocus is true or focus is still within FocusTrapZone
+    const doc = getDocument(this._root.current)
     if (
       !this.props.disabled ||
       this.props.forceFocusInsideTrapOnOutsideFocus ||
-      !this._root.current.contains(document.activeElement as HTMLElement)
+      !this._root.current.contains(doc.activeElement as HTMLElement)
     ) {
       this._releaseFocusTrapZone()
     }
@@ -199,7 +202,8 @@ export default class FocusTrapZone extends React.Component<FocusTrapZoneProps, {
       // even when it's not. Using document.activeElement is another way
       // for us to be able to get what the relatedTarget without relying
       // on the event
-      relatedTarget = document.activeElement as Element
+      const doc = getDocument(this._root.current)
+      relatedTarget = doc.activeElement as Element
     }
 
     if (!this._root.current.contains(relatedTarget as HTMLElement)) {
@@ -282,11 +286,12 @@ export default class FocusTrapZone extends React.Component<FocusTrapZoneProps, {
     })
 
     // try to focus element which triggered FocusTrapZone - prviously focused element outside trap zone
-    const activeElement = document.activeElement as HTMLElement
+    const doc = getDocument(this._root.current)
+    const activeElement = doc.activeElement as HTMLElement
     if (
       !ignoreExternalFocusing &&
       this._previouslyFocusedElementOutsideTrapZone &&
-      (this._root.current.contains(activeElement) || activeElement === document.body)
+      (this._root.current.contains(activeElement) || activeElement === doc.body)
     ) {
       this._focusAsync(this._previouslyFocusedElementOutsideTrapZone)
     }
@@ -374,7 +379,8 @@ export default class FocusTrapZone extends React.Component<FocusTrapZoneProps, {
   }
 
   _handleOutsideFocus = (ev: FocusEvent): void => {
-    const focusedElement = document.activeElement as HTMLElement
+    const doc = getDocument(this._root.current)
+    const focusedElement = doc.activeElement as HTMLElement
     focusedElement && this._forceFocusInTrap(ev, focusedElement)
   }
 
@@ -414,16 +420,18 @@ export default class FocusTrapZone extends React.Component<FocusTrapZoneProps, {
     if (elementToFocusOnDismiss && previouslyFocusedElement !== elementToFocusOnDismiss) {
       previouslyFocusedElement = elementToFocusOnDismiss
     } else if (!previouslyFocusedElement) {
-      previouslyFocusedElement = document.activeElement as HTMLElement
+      const doc = getDocument(this._root.current)
+      previouslyFocusedElement = doc.activeElement as HTMLElement
     }
 
     return previouslyFocusedElement
   }
 
   _hideContentFromAccessibilityTree = () => {
-    const bodyChildren = (document.body && document.body.children) || []
+    const doc = getDocument(this._root.current)
+    const bodyChildren = (doc.body && doc.body.children) || []
 
-    if (bodyChildren.length && !document.body.contains(this._root.current)) {
+    if (bodyChildren.length && !doc.body.contains(this._root.current)) {
       // In case popup render options will change
       /* eslint-disable-next-line no-console */
       console.warn(
@@ -449,7 +457,8 @@ export default class FocusTrapZone extends React.Component<FocusTrapZoneProps, {
   }
 
   _showContentInAccessibilityTree = () => {
-    const hiddenElements = document.querySelectorAll(`[${HIDDEN_FROM_ACC_TREE}="true"]`)
+    const doc = getDocument(this._root.current)
+    const hiddenElements = doc.querySelectorAll(`[${HIDDEN_FROM_ACC_TREE}="true"]`)
     for (let index = 0; index < hiddenElements.length; index++) {
       const element = hiddenElements[index]
       element.removeAttribute('aria-hidden')
diff --git a/packages/react/src/lib/accessibility/FocusZone/FocusZone.tsx b/packages/react/src/lib/accessibility/FocusZone/FocusZone.tsx
index 9a4c3d8568..cbe20b010d 100644
--- a/packages/react/src/lib/accessibility/FocusZone/FocusZone.tsx
+++ b/packages/react/src/lib/accessibility/FocusZone/FocusZone.tsx
@@ -131,8 +131,9 @@ export default class FocusZone extends React.Component<FocusZoneProps> implement
 
     this.windowElement = getWindow(this._root.current)
     let parentElement = getParent(this._root.current)
+    const doc = getDocument(this._root.current)
 
-    while (parentElement && parentElement !== document.body && parentElement.nodeType === 1) {
+    while (parentElement && parentElement !== doc.body && parentElement.nodeType === 1) {
       if (isElementFocusZone(parentElement)) {
         this._isInnerZone = true
         break
@@ -513,7 +514,9 @@ export default class FocusZone extends React.Component<FocusZoneProps> implement
       return undefined
     }
 
-    if (document.activeElement === this._root.current && this._isInnerZone) {
+    const doc = getDocument(this._root.current)
+
+    if (doc.activeElement === this._root.current && this._isInnerZone) {
       // If this element has focus, it is being controlled by a parent.
       // Ignore the keystroke.
       return undefined
@@ -1004,13 +1007,10 @@ export default class FocusZone extends React.Component<FocusZoneProps> implement
   }
 
   getOwnerZone(element?: HTMLElement): HTMLElement | null {
+    const doc = getDocument(this._root.current)
     let parentElement = getParent(element as HTMLElement)
 
-    while (
-      parentElement &&
-      parentElement !== this._root.current &&
-      parentElement !== document.body
-    ) {
+    while (parentElement && parentElement !== this._root.current && parentElement !== doc.body) {
       if (isElementFocusZone(parentElement)) {
         return parentElement
       }