Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Matt & Myles,
For Office 365 tenants, there is a default session timeout in OWA of 6 hours, that is set for all tenants and admins can configure that or disable the session timeout if they desire.
For detail information, please see Session timeouts for Office 365 and Set-OrganizationConfig
If you need further help, I’ll suggest you post a new thread in Outlook>Office 365 category for proper resolution.
Regards,
Neha