Hello,Clifford Crissman
Welcome to the Microsoft community!
I have realized your issue about the Excel Addin.
Since the add-in is based on Excel as a platform to provide more convenient functions, so the add-in can not be launched properly if the add-in itself may be a compatibility problem between the add-in and Excel. The Microsoft community may not be able to provide you with appropriate advice for this add-in.
I wish I could handle your problem, however, the issues seems to require more specialized support, I suggest you try to seek help at Microsoft Learn, where there are more experts in related fields who can provide you with better solutions.
you can click on "Ask a question", there are experts who can provide more professional solutions in that place.
Here is a link to the forum where you can raise specific scenarios and share your idea to help solve the problem.
Sincerely hope that your question will be dealt with appropriately after contact the correct department. Thank you for your understanding!
Feel free to post back if you need further assistance.
Thank you for your understanding and patience and I look forward to hearing from you.
Ryan - MSFT | Microsoft Community Support Specialist