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Hi Amy,
I went through your post carefully and thanks for your sharing with the very detailed error information, it seems like I have managed to find the related similar threads from our community and also the Apple Community. For your reference:
Since a few days I'm receiving the alert "Microsoft SharePoint wants - Microsoft Community
Keep getting pop up for Microsoft SharePo… - Apple Community
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Hence, I suggest you first try to remove Keychains for Microsoft Office. Open the Keychain Access app on your Mac, select the related Office or OneDrive keychain in the Keychains list, and choose File > Delete Keychain [keychain name]. Also, if you are not using OneDrive or other Microsoft services, you can try uninstalling the Microsoft Auto-Updater. Reference: how to permanently kill AutoUpdate - Microsoft Community
I appreciate your understanding that sometimes initial suggestions may not solve the problem very soon. However, we can work together to reduce and resolve the situation. Therefore, please be patience and provide more information back with me so that we can continue working.
Please correct me if I made any misunderstanding and I will be here waiting for your updates.
Appreciate your time and patience. Hope you a nice day and stay safe!
Best Regards,
Mia