Post upgrade Dynamics 365 Portal we were getting following error during inserting/updating record from portal. 

“You don’t have the appropriate permissions.”

To fix this go to “Entity Permission” and make sure that all permission records which have “Create” and “Update” permissions checked also also have “Append” and “Append To” permission checked.

 

Refer to Microsoft support block highlighting this issue.

https://support.microsoft.com/en-sg/help/4020181/portal-entity-permission-enhancement-requires-record-modifications

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