Update AD-FS-Prompt-Login.md

[rodiera]

The right command to use is Update-MgDomainFederationConfiguration not New-MgDomainFederationConfiguration. the latter creates a federation domain configuration, but in this context, this is already in existence. Therefore, an error gets returned "New-MgDomainFederationConfiguration : Domain already has Federation Configuration set."

PreferredAuthenticationProtocol - should not be changed FederatedIdpMfaBehavior - is not always populated and shouldn't be changed in this context.

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[v-dirichards]

@robinharwood, @Xelu86
Can you review the proposed changes?

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team
#assign: @robinharwood, @Xelu86

[rodiera]

Any updates on this?

The current guidance in this document is wrong. Neither FederatedIdpMfaBehavior or PreferredAuthenticationProtocol need to be included here to update PromptLoginBehavior. Furthermore, customers are unnecessarily updating FederatedIdpMfaBehavior and want to revert however there is no way to revert once the property has been updated. So, we are getting pushback on CSS cases when customer follow this guidance and finds out they cannot null FederatedIdpMfaBehavior.

The correct command is.
Update-MgDomainFederationConfiguration -DomainId <your_domain_name>
-InternalDomainFederationId `
-PromptLoginBehavior <translateToFreshPasswordAuth|nativeSupport|disabled>

[v-dirichards]

@robinharwood @Xelu86
Can you review the proposed changes?

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team