After a migration from 2.4.8 to 3.4.2, 'Zabbix Admin' user profile are not able to change the media type of existing or newly created action.
After a selection of an action, when changing the media type, this error appear :
Incorrect value for field "mediatypeid": No permissions to referred object or it does not exist!.
No problem with a SuperAdmin user.
I tried to create a new media type, but same problem.