Can we use the same form on root domain and subdomain?

We have forms in our root domain Contact Us | Newhaven Display International that work fine. The issue is that we have subdomains for the translations (Neem contact met ons op | Newhaven Display International) and all forms submitted from this subdomain are displayed but they dont get submitted. We get the error “Please login before connecting your form” after clicking the submit button on the form.

Can we use the same forms on root domain and subdomain?

thanks,

Anyone from support?