Hi @Domagoj Rade ,
if you have problems with the phone validation in the Azure Account creation process please take a look here: Identity verification by phone
Here are some additional information:
You can use any phone number for verification as long as it meets the requirements. The phone number that you enter for verification isn't stored as a contact number for the account.
- A Voice-over-IP (VoiP) phone number can't be used for the phone verification process
- Check that your phone can receive calls or SMS messages from a United States-based telephone number.
- Double-check the phone number that you enter, including the country code that you select in the drop-down menu.
- If your phone doesn't receive text messages (SMS), try the Call me option.
Source: No verification text message or phone call
Make sure to select the right country code in the drop-down and enter the phone number without the country code.
One option might be to call Microsoft's Global Support: Global Customer Service phone numbers
Maybe they are able to help.
I've noticed a couple of questions/threads related to this issue in the past. But none of them gave an answer how to fix this or if it was fixed at all.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten