wpoi-submit-failure on mapped TLD custom post type page

I have an exit intent popup enabled on a custom post type that has a mapped top level domain via the Multiple Domain Mapping on Single Site plugin. The submission of the form is successful and I can see the entry in the backend list, but on the front end, I get the following error:

<span class="wpoi-submit-failure">Something went wrong, please try again.</span>

as apposed to the success message.