Client Password changes fail even from Admin account

[pduer]

I'm trying to change a Client User's password using an admin account, I get the following error every time:

"code": "Forbidden",

... "value": "Could not reset password. You do not have the permission to perform this action." "reason": "NotAuthorized"

I know the account I authorized with OAUTH2 is an Admin. But is there a role or something missing?