Phone Number Is In The Wrong Format

[mauree]

I am getting an error response

[body] => Phone Number Is In The Wrong Format
[response] => Array

should this be sanitized using add_filter? if so how would I do that?

[zaus]

This is the response from your 3rdparty service, not the plugin, right?

In which case, you can hook to ..._service_filter_args (see source), look for the phone-number field in $args['body']['your-phone-field'], and manipulate it as needed. Or enforce some kind of formatting before submission (I think Gravity and Ninja Forms have this kind of validation, or use custom javascript).