"Message failed to send" Red Error box in Outlook 365 for Mac

Hi everyone - has anyone had issues with sending emails using Outlook 365 for Macs? Especially a red error box that appears at the bottom (attached) and says "Message failed to send Open" The email is then stuck in drafts with the option to continue editing but it is simply frozen in drafts and the only way is to delete and try again. Alternatively, you can go to the webmail version of outlook, find the drafts folder and send from there. This has been happening on/off for several weeks now, no pattern, just happens occasionally.

This version of Outlook 365 is absolutely **** with so many issues

It's a disaster issue; Microsoft support doesn't know how to fix it

So unprofessional!!

Did anyone have a solution to this?

Attached the support answer,

A short and unprofessional answer

Same issue for me and my colleagues. This has been known about for months, please fix it!

I have now version 16.80 and haven't seen this dreaded message for the last week or so, looks promising.

THanks

Jean-François