Veeam Backup for Microsoft Office 365 users: for many of you, backup and restore operations started to fail last week with the "
The remote server returned an error: (403) Forbidden. Access denied" errors appearing out of nowhere. This is one of those "Microsoft suddenly changed API on their end" type of issues again. Lately they happen more often than I'd like, so you do have the right to be frustrated. However, Office 365 is a very actively developed platform, so I get it – one can break nothing only when doing nothing. All I can promise is that our devs will keep doing their best to restore the broken functionality as soon as possible. Anyway, we got very lucky with this particular one, because apparently we got rid of the impacted API queries last month in the
latest cumulative patch while fixing some other issue. So, only those of you who did not have the latest patch installed got impacted. You can refer to
KB4106 to determine which version you are currently on and how to upgrade to the latest and greatest build.