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Title
NI: BTAvailability failed to get freebusy info when Modern Authentication is Enabled (This does not apply for deployment that uses basic authentication for freebusy) -
Description
BTAvailability verification test to lookup freebusy for Exchange Online users failed with the message "Call failed to the Exchange Web Services for - GetUserAvailability".
The logs will have details on the error like below:
"<faultstring>Server was unable to process request.
<Call failed to the Exchange Web Services for - GetUserAvailability()>The SMTP address has no mailbox associated with it.</faultstring>" -
Cause
For modern authentication, you will need to have a licensed account, user with mailbox, to perform the freebusy lookup.
Example of results when modern authentication is configured using an unlicensed and licensed accounts.
1. Licensed Account (user with mailbox)
<?xml version="1.0" encoding="UTF-8"?><string xmlns="http://schemas.binarytree.com/cmt/services/2009/coex">That Was Easy!Merged free/busy data: 000000000000000000000000000000000000000000000000 Merged free/busy data: 000000000000000000000000000000000000000000000000 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Merged free/busy data: 000000000000000000000000000000000000000000000000 Merged free/busy data: 000000000000000000000000000000000000000000000000 </string>2. Unlicensed Account<?xml version="1.0" encoding="UTF-8"?><string xmlns="http://schemas.binarytree.com/cmt/services/2009/coex">Call failed to the Exchange Web Services for - GetUserAvailability()</string> -
Resolution
Assign the Freebusy proxy account a license (user with mailbox) or use basic authentication which does not require a mailbox user.