Office365 and AzureAD has been even more unreliable than usual over the past week or so, plenty of "an error has occurred" pages and delayed mail - as usually Microsoft didn't update the status dashboards (the ones you can see without being able to log in anyway), The other client I work with uses GCP and Google Mail/Docs for business which I haven't noticed any issues with.
Sorry I should have been more clear in my comment. I meant to emphasize that the outages were not related to COVID-19. So there is no point of repeating the same thing everywhere as it is not relevant.
