Hello Timmy,
Please login to your UME using the below URL
http://<HostName>:<PortNumber>/UME
and select the Role option in drop-down and then search fro the role idm.developer
Once you are able to find the idm.developer role, please check whether this role has idm_authenticated_studio action or not.
It seems idm.developer role doesn't have idm_authenticated_studio action here. Please check and confirm so that we can further help you.
Regards,
C Kumar