I wonder is there a way to validate the format of the mobile phone number provided by the user and show the notification for any format issue when they enter the number and enable the SMS MFA method. For example, when the user clicks on the send a one-time code button, if the mobile phone number is in an invalid format, there will be a red notification popping up. Can we achieve this by modifying the theme?

I wonder is there a way to validate the format of the mobile phone number provided by the user and show the notification for any format issue when they enter the number and enable the SMS MFA method. For example, when the user clicks on the send a one-time code button, if the mobile phone number is in an invalid format, there will be a red notification popping up. Can we achieve this by modifying the theme?