Have you tried to uninstall and reinstall the Premiere Clip app on your device?
Yes I have - even did a reboot between installations for good measure - no change in the issues I mentioned.
Can you try to clear the cache and then connect to a different network and check if the app tries to work properly?
As I stated in my initial post, I have tried this on different networks already to no avail. What cache? I've not found anything related to a cache anywhere in the app or the app's settings on my phone, and to be honest I don't see how that would make a difference after a clean reinstall.
I've worked in tech support for almost 9 years now so I'm going to assume these are standard suggestions you're required to make, because they don't seem particularly relevant given the details I've already provided. Can you please answer the specific questions in my original post? If not, can you refer me to someone who can?
From the 2 issues you've described, it sounds like your account is in a bad state. Please try doing the following
1. Sign out Clip and quit the app
2. Launch Clip and create a new Adobe ID from the Welcome Screen
3. Within the new account, create a new project and attempt to add a song from your iTunes library – If a song is added successfully, sign out of the current account and sign back into Clip with your primary Adobe ID and attempt to add a song from your iTunes library and modify your user settings.
Sorry, I know this is not an ideal process but it has helped a few users in the past. Let us know if this resolves your issues.