While I configure all the settings for the SMS and I already send messages from SMS Center successfully.
When I create an auto notification with SMS channel for Payment Entry that send alert on submit, then I tried to create a Payment Entry for a customer who already have a mobile number I get this message
( Please enter valid mobile nos )
those are the information of the versions I installed
ERPNext: v13.42.5 (version-13)
Frappe Framework: v13.46.2 (version-13)