I'm in the same boat. Activation through the app failed 3 times. I then tried the QR code, which also told me I'd tried too many times.
I wasn't able to submit a ticket, because even when I filled out all of the fields on the ticket form, the Submit button remained unclickable.
Lastly, I can't even log in to my account, because the MFA is attempting to send a code to the number that I don't yet have access to.
I messaged the forum support on Monday, but haven't heard from them yet. Thankfully I am adding this as a second device and I don't need access, I pity the people who ported their number and have been unable to make calls/receive texts for days now.
I'm still hoping to hear back from support...
