We announced at Ignite that we are actively working on bringing dynamic plus aliases to Office 365.
To get around existing usage, the plan is for an opt-in setting. Our ETA is to have this available for all customers by the third quarter of 2020.
I will keep you updated in Uservoice on our progress.Anonymous commented
This is totally unacceptable. Sadly, our alumni association decided they didn't want to pay in-house services anymore/and or in-house did not want to deal with us so we were forcefully migrated to O365. Now what am I supposed to do with all of the e-mail addresses that have been out in the wild? I don't even know what all of them are. In most cases it fails silently to the sender as well as the recipient, to make the problem even worse!