Can't activate Microsoft 365 (purchased) on new Mac
A few years ago, I bought (outright purchase, not subscription) Microsoft 365. I have recently changed computers from a seven-year-old model running Ventura to a new M4 iMac running Sequoia. I cannot activate Microsoft on the new computer.
If I open the Word or Excel program and then select “About word” or “Activate office” from the File menu, I get a message that says “Licence not activated” but does say “Belongs to:” with my email address and also shows a product ID and a session ID. It invites me to refresh. But if I try this sometimes it will not accept the email address which it has indicated is mine, sometimes it will say “loading” and then go on loading forever.
If I open a Word file I have previously created, it cannot be edited or saved. There is a message "action required. We’ve detected a one time purchase licence. This licence can only be used with Microsoft 365 apps downloaded directly from Microsoft 365.com.
So I go to the Microsoft 365 site and login. It accepts my email address and the associated password, but lists me as having no products. I have followed all the instructions I can find but just go round and round in circles. There seems to be no provision for speaking to a human being by telephone or sending an email.
Does anyone have any suggestions?
iMac 21.5″ 4K, macOS 13.7