Certificate errors on Captive Portal

Having this issue on and off for a few weeks with CnMaestro X cloud. Using the HTTP only redirect to 1.1.1.1, was using a different website but now redirecting guest users to https://www.google.com after they approve terms and conditions on the captive portal and click login. Cambium support checked our settings, says “looks good” but with no way to add our own certificate we are kinda outta luck with the options available in CnMasetro X. Any help would be appreciated.

Can you give a detailed description of the sequence of steps that leads to the certificate error? If possible, can you include screenshots that show the URL?