Invalid AWSPhone on AppSync

I’m having the same issue. AppSync is returning an error when a field is of type AWSPhone and has correct payload.

Here is the error message returned: "Variable 'phone' has an invalid value. Unable to parse +13451112222 as a valid phone number."

The phone number +13451112222 is valid (I put 1112222 here to hide real one), and passes validation on many other phone validation libraries. Is just that the area code 345 is from Cayman Islands.