JS to hide a form button if validation fails

I have a WPFORM with Loqate. Loqate is a service that real time checks the email and phone fields and produces a cross or a tickbox

I would like our submit button on the WPFORM to dissappear if loqate determines the email or phone number field are incorrect. (shown a cross). If loqate things it is valid the submit button needs to remain

website is a wordpress one and hopefully this is a quick job. Contact for more info