استخدام رقم التعريف الشخصي bin للايباد

This option should be in Settings -> Cellular or Mobile Service -> SIM PIN.

Use a SIM PIN for your iPhone or iPad - Apple Support

استخدام رقم التعريف الشخصي (PIN) لبطاقة SIM في هاتف iPhone أو جهاز iPad - Apple دعم (SA)

By default, the eSIM does not have a PIN code enabled. You should contact your carrier about that and ask, if there is an option to enable the PIN for the built in eSIM.

Which iPad model do you have?

Did you already contact your carrier about that?