I did find a helpful answer here, but in addition to other suggestions I'd like to suggest that when you ask for an e-filing PIN it would be a good place to mention that this is is NOT the same as the IP PIN. With the two terms side-by-side it looks obvious, but after a year since last filing my brain just saw "blah-blah PIN".
I went through the whole process, was told my return was perfect, e-filed, and was rejected because I never entered the IP PIN, which was never asked for.
I'm using Premier 2024, desktop, on Windows 11.
