@ChaseBeasley I think that the Pandora app is still associated with your old Apple ID.
Try signing out of the current Apple ID you’re using (whether it’s the old or new one). Then, delete/uninstall the Pandora app.
After that, sign back into your new Apple ID and download/reinstall Pandora under the newly created Apple ID.
Even tho you have a new Apple ID, app purchases (even free ones) can still be associated with old Apple IDs, which may prevent you from updating apps or making in-app purchases in the future. It sounds like you need to “purchase” the free Pandora app under your new Apple ID. You may need to do this for other apps too so they are “purchased” or downloaded under your new Apple ID.
I’m hoping this makes sense and helps with your issue.
Thank you for replying but it’s been a few days and I have yet to see that pop up I described so I believe it was a matter of the phone itself getting used to the new ID