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.Krzysztof Wolny supported this idea ·Krzysztof Wolny commented
It would be nice to dynamically create email aliases, using e.g. "+" (like in GMail) so if my account is firstname.lastname@example.org then any email sent to email@example.com will be delivered to my inbox, without any additional setup.
This will allow to use different email addresses in different sites, etc.