Thanks @orderhive for the information .
This looks to be a bug in the Partner UI where its not providing the correct grant type to the client .
The team is working on the fix and will be release soon .
As a workaround we have updated your clientID M4sPtfxKpk with the correct grant Type .
Let us know if this solves the issue .
Thanks
Anurag
05-31-2018 01:48 PM