Using ArcGIS Desktop 10.8.1
We are trying to create a replica of a geodata service from an external client. They have provided their GIS Server URL and credentials. I can connect to the GIS Server in ArcCatalog and see a Geodata and Map service.
I've opened ArcMap and can bring in the Map Service and see the data. Using the distributed geodatabase toolbar in ArcMap, I've ran through the Create Replica wizard. I am pointing the data to an SDE database on our SQL Server 17.
I'm getting this error at exactly 60 seconds after running through the wizard:

The 504 error makes me think it's something on their end. I had them increase the timeout rate on the geodata service to 6000 seconds. Any other ideas?