How to deal with this problem:
1. Make sure you've entered the correct mobile phone number.
If the phone number contains mistakes, click Change number.
Enter the correct number and click Confirm.
2. Request the code once again.
To do so, click Resend:
Enter the code in the Confirmation code field and click Confirm.
A new code can be generated only twice in half an hour. If you have requested a new code more than twice in the past 30 minutes, you will see the following notification in the bottom-right corner:
To request another code, wait 30 minutes since the receipt of the last code.
3. If none of these recommendations helped, contact support.