The phone number is automatically filled in an invalid number when download page login account verification

step1:  open the website : https://developer.arm.com/downloads/view/DS000B

step 2:  click to log in

step 3:   fill in the account password, then choose "SMS text message" to receive the comfirmation.

And then there is the error: The phone number is automatically filled in an invalid number, like this:

We have the following number on record for you. We will send a code via SMS to authenticate you.