Microsoft has made a change to Azure sign-ins is forcing the use of TLS 1.2 for the connection. These changes were not expected to be implemented for some time but it seems they have rolled them out as of early December.
Workaround
Force O365/Azure collections or OnDeman connections to work with TLS 1.2 by using the following steps on the Change Auditor agent server specified in the O365/Azure audit template:
1. Disable TLS 1.0 and 1.1 via SChannel registry keys:
For TLS 1.0:
For TLS 1.1:
2. Enable TLS 1.2 via SChannel registry keys
For TLS 1.2:
3. Implement SchUseStrongCrypto registry key
4. Reboot the server
5. Event collection should be working again.
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