Hello Cursedvision,
If it’s the correct number but you’re still not receiving the verification code, you may want to check out the article here for steps you can try:
If that fails you can indeed also contact us for assistance with this. You’ll find the link over on this page:
Finally in regards to the migration and removal of deprecated authenticators, this process has started but is being processed in batches over time, so it may still be a few weeks until it can be completed on all accounts.