Dear Nicholas Brosnan
Good day! Thank you for publishing in Microsoft Community. We are happy to help you!
Based on your description, since your problem is related to Adobe, and since we are focused on technical support for Microsoft 365 Business Exchange Online, which is not professional for Adobe. For Adobe incident, to help you better and not waste more time, Irecommend that you ask questions (based on) in Microsoft Q&A forum. Technical engineers over there specialize in Adobe-related issues, and experts will focus on queries to further assist you.
Thank you in advance for your understanding! Your patience and cooperation will be greatly appreciated. I hope all the best!
Sincerely
Kerry Chen | Microsoft Community Moderator