ValueError: 'id' mismatch in returned update response

[Tre-Seibert]

In the code snippet below I am updating fields of a contact with the display name = "Test Contact". I get the following, 'ValueError: 'id' mismatch in returned update response' error. The error occurs when I contact.save(). However, the fields for the contact are still updated in Outlook despite the error. Any ideas how to bypass this error?

    # Retrieve each contact from TB Client to compare to report csv file.
    for contact in fTBClients.filter(display_name = "Test Contact"):
        contact.company_name = "Test Corp."
        contact.customerIDProperty = "TEST"
        contact.save()
        print("Contact saved")

Traceback (most recent call last):
  File "/Users/treseibert/Library/CloudStorage/OneDrive-SharedLibraries-TB/DEV - Documents/Office 365 Sync/app2.py", line 84, in <module>
    main()
  File "/Users/treseibert/Library/CloudStorage/OneDrive-SharedLibraries-TB/DEV - Documents/Office 365 Sync/app2.py", line 63, in main
    contact.save()
  File "/usr/local/lib/python3.11/site-packages/exchangelib/items/item.py", line 155, in save
    raise ValueError("'id' mismatch in returned update response")
ValueError: 'id' mismatch in returned update response

[ecederstrand]

In Exchange, all items have an ID and a ChangeKey value. When you update an item, the ID is supposed to stay the same, and the ChangeKey is supposed to change. On update, the server will return the ID and the ChangeKey of the newly updated item.

In this case, it looks like the server also returns a new ID for the updated item. You can confirm whether this is the case if you enable debug logging and capture the request and response XML documents. If the server indeed returns a new ID on update, then we'll just have to relax this ValueError check.