Microsoft.Crm.CrmException: An application user’s access mode cannot be changed error in Dataverse (Dynamics 365 / CRM)

Just a short one –

As the error message suggests “An application user’s access mode cannot be changed “, it is not possible to change the Access mode of an application user from Non-interactive to either administrative or Read-write.

While trying to change the Application User’s Access Mode to Read-Write, the error message –

Get all the details about different type of users –

https://docs.microsoft.com/en-us/power-platform/admin/create-users#user-types

also check – https://community.dynamics.com/365/sales/f/dynamics-365-for-sales-forum/367844/when-uisng-non-interactive-users-when-using-application-users

Hope it helps..