I used to be able to successfully package this Pro project. I then ran into an issue with GP tasks where I realized that I hadn't accessed the data inside my Pro doc through our portal, but instead had pasted the feature service URLs directly into it using "Add Data" > "Data from path". After repathing my layers to go through my portal group now I get the below.
Status: Failed StatusMessage: ERROR: code:400, Invalid URL., Bad syntax in request.
This obviously indicates some kind of permissions conflict but I'm struggling to find it. Here's my setup: