Help finding product key for MS Word

[Violetta04]

I set up my HP 14_laptop yesterday and opened Microsoft Word.  At first I got a notification saying that on April 30th (next Wednesday), I would be required to register the device using the "product key.". I don't know where to find this product  key; however, I am no longer getting that notification on the screen when I open up Word.  My questions are 1.). Where do I look to find the product key? 2.) Will I still need to enter this key to keep using Word?

[Valsimot]

You need to purchase a key for MS Office ( Word, Excel, ...) on the laptop you only get a free trial.

[Violetta04]

How do I go about purchasing the key?  (I had heard elsewhere that I just need to sign into my Microsoft account to see my product key, but I have signed in and do not see the key listed.  Is that because I haven't purchased it?)

Additional information:  On my Microsoft account, it says I am registered for Microsoft 365 Family and will be billed monthly.

[Violetta04]

I talked online with a Microsoft tech and was able to install Microsoft Word; I didn't realize the previous one was just a trial version.  I haven't tried to locate the product key yet, however.