Has SharePoint O365 stopped support of /_vti_bin/UserProfileService.asmx endpoint recently?

Until now, the legacy /_vti_bin/UserProfileService.asmx was the only possible API to update SharePoint o365 user profile properties. Unfortunately, recently it started to return Server was unable to process request. ---> Attempted to perform an unauthorized operation. error message.

I am sure there were no changes to the account name/password/role in o365 from our side. I could not find any announcement or any additional information regarding it. Does anybody experience the same issue or can confirm the problem?