Issue adding Utility Network service layers to ArcGIS Pro 2.5.1

[SkipHeise]

Hey All,

I'm having an issue adding UN service layers to ArcGIS Pro 2.5.1 after they have been published on the portal. Portal and Server are version 10.8. The database is registered & the server is federated. I am using data from Esri's Solutions for the Water Utility Network.

The services publish fine, and are accessible through the portal, but I encounter this error when I go to add the service layers to the map: 

Has anyone else encountered this issue?