When using the Microsoft 365 Connector in Snow Integration Manager (SIM), the connection may fail with a 401 Unauthorized error. This typically indicates that the user account configured to access the Microsoft 365 API is invalid, disabled, or no longer has the correct credentials.

In the SIM logs, you may see the following error:

Authentication: Empty 

HttpError Status code 401 Unauthorized does not indicate success. 

Status Code: 401 Unauthorized 

Authorization: Basic ** Hidden **

This failure prevents Snow Integration Manager from retrieving Microsoft 365 data, as the connector is unable to authenticate with the API.