Dear Buckleau
Good day! Thank you for posting to Microsoft Community. We are happy to assist you.
I understand you are experiencing an issue with changing AD passwords via Microsoft 365. I do understand your query here but, as your query related to Active Directory and since Microsoft has specific support channel resource for certain different support scope and attributes, we are belong to Microsoft Forum Community mainly focused on Microsoft 365 Exchange online only. Therefore, we provide some limited knowledge about some aspects of Active Directory related scenarios. For Active Directory, we have a dedicated team with special expertise in Active Directory queries, so would you mind to connect and place your query on our dedicated Active Directory - Microsoft Q&A. We believe they will give you accurate and efficient solution for your concern.
Thank you for your precious time and understanding. For other concerns, please do not hesitate to add your post in the Microsoft Community Team.
Stay safe and healthy. Have a nice day!
Best regards,
Allen | Community Moderator