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I bought & installed Office 2021 a few years ago and have used it without problems since then on my MacBook Pro. Last night, I opened an Excel file, made some changes and, when I tried to save it, I got a message which stated "Action required. We've detected a one-time purchase licence. This licence can only be used with Microsoft365 apps downloaded directly from Microsoft365.com". I was unable to save any changes and it appears I am also prevented from printing. I have checked and Word has the same issues. Also, in the top left hand corner, when I click on "Excel", there is an option "Activate Microsoft365"
Three days ago, I downloaded a new version of Teams - a product I had used only once or twice previously - and wonder if that has caused this snafu. Apart from that, I have not downloaded anything recently which could have caused my system to think that I might be interested in using 365.
How do I get all this "365" stuff out of my laptop and get Office 2021 working as it did until yesterday
Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
This may be caused by Office auto-updates installing the wrong version of Office on your Mac.
Use the steps provided on this link to uninstall Office from your Mac:
Then restart your Mac and go to your Microsoft account online to re-install Office Office 2021 from there.