I want to join beta program for Rog Phone 3 I also registered previously but there is no update on it
I believe there isn't a beta setup for ROG 3 Android 12 yet.
Otherwise, for when ROG 3 had A11 beta, it was done via the FOTA app I believe - so probably worth keeping an eye on that at the moment.
Keep an eye out for any beta enrollment post here:
The rollout plan is here:
As previously mentioned by Titan on a similar thread by user. You should receive a mail soon.