FM BetterForms generates custom subdomains with the *.fmbetterforms.com domain name space and will automatically generate and maintain a security certificate For custom domains you will have to follow a few steps to configure.
If your account permits it, you can map fully customized domains to BetterForms servers.
Custom Domain Configuration
To map the portal.mycompany.com domain to one of your apps, visit your DNS provider / registrar ( eg GoDaddy ) and add a CNAME record for portal.mycompany.com pointing to alias.bfoperations.com
In the BetterForms editor under your apps environment page, add your new custom domain.
Check if your CNAME record has propagated. You can check here: https://dnschecker.org/#CNAME
BetterForms will not be able complete your domain configuration until this step has been done.
In the BetterForms App editor under the deployments section, add your custom domain. BetterForms servers will complete the connection and generate the security certificate.