Dear IntuneBeginner
Good day!
Thank you for posting to Microsoft Community. We are glad to assist!
Based on your description, I understand you concern with the error message "Failure to load the application settings for package Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy" and it may be caused by several factors, including issues with the device image or the installation of Office 365.
Office 365 Installation Issues: A bad install of Office 365 can also cause this error, you may have a try to Repair an Office application - Microsoft Support or re-install the office 365.
Security Software Interference: Security software on your device might be interfering with the
In the meanwhile, to try closing all Office apps and then clearing the %localappdata%\Microsoft\TokenBroker\Cache folder. This folder contains the token for the Microsoft.AAD.BrokerPlugin, and clearing it can force the system to regenerate the necessary tokens.
Also, if you are an organization admin, you can also raise a service request to report this symptom to our online channel through the O365 admin center if you have the permissions. A support agent can further connect with you remotely, for further troubleshooting and involve the backend team where need be. Get support for Microsoft 365 for business -- Online support.
Thanks for your precious time and your understanding would be highly appreciated. Have a nice day!
Best regards,
Allen | Community Moderator