I have the same problem. Activated new plan tonight. Number ported over very quickly. But when trying to login to the PM app the 2FA doesn't arrive. I'll check the link you provided. Fingers crossed.
Yup, on the PM network (I disabled wifi to ensure full functionality). No issue with data. No issue with in/out calls. No issue receiving and sending text messages to friends. The only text messages I'm not getting is from the PM app to verify 2FA.
I can log in to my PM account from a desktop since it's sending me a code to my email. The issue is the app on my mobile phone. First step: it sends me a code to my email. I get in no problem. The trusted device function is not working as I select it...