Summary

Trend Micro is aware of multiple customers who reported experiencing failed login for some users' Azure-Active Directory Accounts on Microsoft Office Apps like Outlook, OneNote, OneDrive, and Excel. Users described the issue as being stuck in a login loop for Microsoft Office 365 Services.

From the initial investigation, Event Application errors were found in the logs collected from the reported affected devices:

Failure to load the application settings for package Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy. Error Code: -2147024864
Failure to load the application settings for package Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy. Error Code: -2147024891
Failure to load the application settings for package Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy. Error Code: -2147024893
Failure to load the application settings for package Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy. Error Code: -2147024894
Failure to load the application settings for package Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy. Error Code: -2147024864
Failure to load the application settings for package Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy. Error Code: -2147024894