Hi @gshapiev ,
Are you trying to call REST API Admin - Datasets GetDatasetToDataflowsLinksInGroupAsAdmin? Is the problem persist on? And it seems that there is one ICM ticket about this REST API before, it had been resolved. Not sure if this is what you are saying...
If you want to raise the ticket to issue community, you can check the following page...
Community Support Team _ Rena
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.