Office 2016 asking for a key after 10+ years, no clue why or where the key is
Literally more than a decade ago I installed Office16 on my parent's PC with a valid retail key. It's been working fine since then.
Then all of a sudden today it's asking to either login with an account, or to enter the product key.
I have no clue where that key is, or why after 10+ years it cares now. Is there some way to retrieve the key? I've tried looking in the registry where a couple articles suggest with no luck. Any idea why it's asking for this out of nowhere?