Have you printed ArcGIS.com Marketplace Premium Services from Portal for ArcGIS that's Federated with an on-premise ArcGIS Server Site?

[BillFox]

I ran into BUG-000090817 Printing ArcGIS.com Marketplace Services from the Portal for ArcGIS map viewer using a print service from a federated ArcGIS for Server installation fails.

[BillFox · Accepted solution]

Stood up a separate non-federated ArcGIS Server machine to use it just for the ArcGIS Server printing URL.

Set the print widget to use it instead of the print service from the normal ArcGIS Server print service.