Clone report to group POST fails with 400 status code and no message

[KarlisJan]

I am trying to clone report to group using Postman. To be clear I have set up the token and permitions, i am able to perform multiple GET and POST calls. 

However 

 https://api.powerbi.com/v1.0/myorg/groups/{{groupId}}/reports/{{reportId}}/clone

 with proper params as per docs fails with 400 status code and no message.

I have found several simalar issues for different GET calls but none of the workarounds works for me (tried adding header "Accept: none" and params $top=3000, etc)

I have debuged this call to be 100% sure that the call is correct!