My host said to me:
Ah okay, so from what I’m seeing that warning is occurring due to opcache being disabled on Cloudsites for security reasons. Seems like for some reason the contact form is attempting to use an opcache command when being submitted, but these are not allowed on our platform so that warning is displaying
Can anyone shed light on this? How can I get this to work? I also installed WP Mail SMTP and hooked it up to sendgrid for all outgoing mail.