To be completed by the original poster:
CMS Version
3.1.2 (docker on debian 11)
Player Type
Windows
Player Version
v3-R303.0-win32-x86
Issue
When i create a new Dataset from Remote-Data with a Bearer-Token (that is 331 sings long) i am able to call test-data from the source but there came an error when i click save.
When i am cutting the Token the save button works.
So it is possible that the Token is too long for the DB?