Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Dear Barry Noble,
Good day!!
I'm sorry to hear about the trouble you're experiencing with the Register-PnPEntraIDAppForInteractiveLogin command.
This community is geared more towards to Microsoft 365 Office and SharePoint Online general and built-in feature queries.
Consider that your question is related to PnP PowerShell, to make sure you get the dedicated assistance, I sincerely recommend posting your concern to the specific channel Microsoft Q&A Community with PowerShell tag and Entra ID tag: Microsoft Entra ID - Microsoft Q&A (click 'Ask a question' from upper-right corner)
Members and engineers over there are proficient in the knowledge of PowerShell scripts queries. They will focus on the specific situation on your side and provide specific suggestions for you. We are sure that our experts from that team can address your query effectively and accurately.
Thanks for your understanding and cooperation! Hope you have a nice day!
Sincerely,
Tina | Microsoft Community Moderator