I'm using Enterprise Portal 10.9.1 (Windows) and trying to deploy the Citizen Problem Reporter Solution.
According to documentation, I should be configuring the solution within the portal using the Solutions app, not using the Deploy Solution Tool Add-In in ArcGIS Pro. Even if I wanted to use the Deploy Solutions tool in Pro, I couldn't because it is incompatible with my version of Pro (3.0.3).
I'm having trouble editing/creating domains for "Type of Problem" of the hosted feature layer views within the solution (blight problems, Animal problems, etc.). When I go to the item page for the hosted feature layer view -> Data -> Fields -> Type of Problem, the List of Values (Domain) is not editable. See screencap below.

I can't figure out how to edit this domain within the portal and I can't use the Solutions Deployment Tool Add-In because it is incompatible with my version of Pro. The Configure the Solution documentation says to use the Deployment tool to modify domains, but as far as I know, that is not possible.
Any ideas?