TM Service API documentation not available

hi,

When I try to access the TM service api documentation at https://groupsharedev.sdlproducts.com/docs/ui/index , I get this error message:

{"errorCode":"AuthorizationError","message":"You are not authorized to access this resource","causes":null}

(same result if I try this on our own groupshare server)

Can you please help, how can I access the API documentation? Is there any public source maybe?

Thank you,
Tamas