Office 2021 for Mac hangs and asks for reactivation constantly

[NeilC1965]

Just upgraded my Macbook running macOS Big Sur from Office 2010 to Office 2021. Purchased from Amazon.

Installed ok, but hangs a lot and although I have activated it via Microsoft , it requests reactivation again and again every time I use one of the Apps. It is unusable at the moment. Very disappointed as it cost a lot of money. No access to any tech support at Microsoft as all appears to be online without any satisfactory solutions
My old 2010 version worked perfectly , but was no longer supported. how ironic!

Any advice appreciated.

[#2]

I have the exact same problem :\

[#3]

@dexterp37 

No way of contacting microsoft for support. I contacted my vendor (Amazon). They have given me a full refund. I purchase Office for Mac 2019. Installed and no issues. How can Microsoft get this so badly wrong for a new product launch?

We will not be alone with this issue!