Can't Install 365 on Mac Air Sequoia 15.7.1

I have a 2024 Mac Air with the latest Sequoia OS, 15.7.1. I am looking to replace MS Office Version 16.101 with MS 365. I have uninstalled 16.101 three times and then tried to install from the online MS 365 site three times, and each time I end up with the old Office 16.101, not 365. I have spent endless hours online and by phone with MS bots and personnel, and with the JustAsk technical "service" they referred me to (which was a waste of $45). No one has an explanation and they just keep telling me to uninstall and reinstall.

There seems to be some technical incompatibility between 365 and my Mac, so when I go to download it feeds me 16.101 without explaining what that incompatibility might be. I'm not a techhead, but I have used Mac Airs for years and MS for decades without such problems. 

Has anyone else had such problems? Any suggestions?

Thanks for any help.