I have tried to enable the access to the Access my cases and activities as per The docs here - https://docs.civicrm.org/user/en/latest/case-management/set-up/
Access my cases and activities: allows a user to create new cases, add activities to the cases they've created and edit those activities. Users with this permission can NOT see cases or activities created by others.
However, whenever a user with that permission tries to access their own case they get an access denied. I think it has to do with the edit activities that are in cases. Has anyone else had this issue. It makes the "Access my cases and activities" permission unusable.
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