"Sorry, something went wrong while initializing the app."–Outlook app error after upgrade to 9.1

Problem: After upgrading a CRM environment from 8.2 to 9.1 we had the problem, that our outlook app showed the users the error: “Sorry, something went wrong while initializing the app.”

Solution: The securityrole of the users needs the new “model-driven App”-privileg under “Customizations” –> “Model-driven App” –> “Read”

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More information: You can find more necessary information about required privileges of the outlook app here: https://docs.microsoft.com/en-us/dynamics365/customer-engagement/outlook-app/deploy-dynamics-365-app-for-outlook#provide-security-role-access

Dynamics 365, Dynamics 9.1, Outlook Client