Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
I did participate in "insider" for Windows mobile years ago, but I don't think there is any connection to my O365 Account. With the office Account I never participated in any "insider".
Trythis linkdirectly into your management menu. There it was available for me.
If that doesn't work...
Wasn't there some article in the press last week that from 2nd october on O365 home will have get more license (user to share with)?
That could to me indicate some product update, perhaps they'll release this feature along with it.
That's not too far in the future.