We cannot send a text message to this number.

I have tried all the above options, but nothing works. Outlook has locked my account. Every time it asks me to enter my cellphone number so it can send me a security code, I always receive this response, no matter what I do: "We cannot send a text message to this number." There is nothing wrong with the number.

Please help.

I was havet same problem. I tryied others internet browsers... Not work.. But whem i use my iphone safari browser it work. I go in microsoft pages on my phone; put my phone number and they give me the code.

Sorry about my english. =)

My father had this problem and I was helping him remotely. Could not get it to send a text to any phone number. Tried everything else listed. Finally tried logging in on my computer and it worked. Microsoft is probably blocking your IP address or device (or both) after too many unsuccessful tries. You need to use a completely different device, phone, laptop, etc, or use a VPN, or both. Windscribe is a free VPN service to use. Once you get back in be sure to generate a Recovery Key in your account settings, then use the Snipping Tool to screen cap it. Save a copy to your Documents folder, and take a picture of it with your phone. If you don't have a backup email address, create one and email it to yourself as well. It's all a PITA, but Microsoft won't chat and help you, so you have to do it yourself.

I found the solution on a different thread - try using a different browser or clearing the cache.

Try signing in to your Microsoft account via Skype. I'd tried every other tip in discussions related to this and I stumbled upon Skype sign in and the same looking dialog box which wouldn't work when trying to sign into Microsoft or Outlook allowed me to enter my phone number and it sent me an access code which unlocked my account.

No idea why but this worked!