If the copyright or work or school account isn't working, see I forgot the username or password for the account I use with Office. Assign a license to a user directly Sopra the Office 365 portal by selecting a check box on the licenses page for the user’s account. https://microsoft-office-2021-sta53196.uzblog.net/5-elementi-essenziali-per-microsoft-office-2021-standard-42924760