I've previously signed in and downloaded the first beta (and manual reset) for my Nokia 7+. After some trouble signing in again today, I've managed to reset my password and get in. Put in my IMEI, network, and location, and get told,
Sorry, it looks like beta labs isn't currently supported on your phone.
I'm pretty sure it should be, so has something gone wrong somewhere?
Currently there is no beta labs program for Nokia 7 plus. The Android P developer program, although is available and you can register >here<. But be aware that this program is meant for app developers to test their apps for the next version of Android.