While using Microsoft Dynamics CRM on-premises users may be prompted for authentication credentials once every 24 hours. This can happen for both users of the web client along with users of the Microsoft Dynamics CRM Outlook client.
To determine whether your organization had this update applied, check your Microsoft Dynamics CRM Online version number. Select the gear icon in the upper-right corner, and then select About. Update information Microsoft Dynamics CRM (on-premises) 9.1 Update 1.42 is now available. The following file is available for download from the Microsoft Download Center: Download the Microsoft Dynamics ...