Import csv get user userprincipalname

https://docs.microsoft.com/answers/questions/60045/export-objectid-of-users-listed-in-csv-file.html
https://red7solutions.co.uk/get-aduser-attributes-from-csv-list-of-users-powershell/
https://community.idera.com/database-tools/powershell/ask_the_experts/f/active_directory__powershell_remoting-9/21193/import-csv-with-displayname-get-samaccountname-output-csv

https://www.manageengine.com/products/ad-manager/powershell/get-aduser-import-csv-module.html

https://notbad.tech/all-things-it/powershell/how-to-bulk-change-the-upn-for-a-list-of-users/

https://blogs.msmvps.com/richardsiddaway/category/powershellandactivedirectory/

https://kb.intermedia.net/Article/1712

https://www.adaxes.com/tutorials_ActiveDirectoryManagement_ImportUserAccountsFromCSVFile.htm

http://woshub.com/get-aduser-getting-active-directory-users-data-via-powershell/

https://www.michev.info/Blog/Post/3149/remove-all-office-365-licenses-for-a-group-of-users-from-csv-file-via-the-azure-ad-powershell-module