Testflight test information input form error

Can I post about Apple Store Connect issues here? While entering test information to use Testflight, the phone number in the contact information behaves abnormally. I was told to enter only numbers, but even if I enter only numbers, an error occurs during validation. I entered it in the Korean form, but is it okay to use it in other languages? Does anyone know a solution?

Testflight test information input form error
 
 
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