Unable to verify account by sms from Argentina

I'm using my own domain email (through domains.live.com): rotaractjuninsur.org.

However, the email account I created is unable to send email. I get a message saying "Please verify your account. We've noticed some unusual activity in your Outlook account. To help protect you, we've temporarily blocked your account."

I attempted many times to enter my cell phone in different ways and I never get the text with the code.

I went to https://account.live.com/summarypage.aspx and added an alternate email (my personal @hotmail.com email) and my cell phone number. In this case I was able to add the phone number through a phone call, and succeeded.

But I still get the message about having to verify my account every time I try to send an email, and I'm requested to provide a phone number again.

I urgently need to use this service. How can I enable it??

Thanks.