TOTP not showing under the Login details

I’ve purchased the Premium Membership about half an hour ago.
The premium membership appears on your website.
But when I try to add a 2FA of an account from my iPhone, the App lets me scan the QR code and all the rest, but when I tap save the TOTP generator doesn’t show up.
I’ve synced the vault many times, but nothing happens.
What’s wrong?

I’m on iOS and both the OS and the App are updated.

You may need to log out of your mobile app completely and log back in, you may instead just be “locking” your account instead.

It works. Thank you.