Thanks for the interest. The full story is: I have a desktop on which Office Professional 2010 was installed in 2017. I also have a copy Office Home and Business (2 PCs) but it wasn't installed on a current PC. The Surface Go had Office Home and Student installed in 2019. I also have a subscription for MS 365 Family but it's only on my daughter's PC. (None at discount prices.)
Normally I only use the desktop for emails (POP and pst files), but in August 2025 I was travelling and needed access to my emails. I installed Office Professional on the Go (didn't have USB for Home and Business) and it worked perfectly. However the Go had limitations and I retired it on my return. I then tried to install Office on the 1-day-old laptop (13 October). It loaded the program but the message was that the activation key wasn't valid and then a new program downloaded. I don't what that program was.
When I tried to log into my MS account the message is "The user name might not be correct..." It is but the Family 365 might have a different account, but that login also doesn't work.
The main issue is that I can't contact Microsoft Support to sort out the problem. The secondary issue is that I have paid for programs that are fully functional, but apparently MS says that you now can't use them.