> It’s pulling the actual multisite url as opposed to the domain mapped url which is causing page errors.
When you register the Optima Express plugin, the URL for your site is recorded and used for the IDX Pages. You may want to try refreshing your registration in the WordPress Dashboard > Optima Express > Register > Refresh registration (click)
> Its forwarding to the url actually but providing none of the data that its suppose to on the page. https://gmcre.com/homes-for-sale-search/ the search is for another property search plugin that isn’t related to the IDX.
It looks like the theme template is not outputting the IDX content to the page. You may want to try an alternate theme template is one is provided by the theme. You can change theme templates at WordPress Dashboard > Optima Express > IDX Pages
I hope that helps. If you would like additional assistance with this, please email [email protected].