To connect a custom domain you add two records at your DNS provider.
; Ownership verification
_situs-verify IN TXT "situs-verify=<token>"
; Routing
@ IN CNAME tenants.situs.studio.The TXT token is unique to your domain. After both records resolve, ownership is verified and an SSL certificate is issued automatically.
Some DNS providers don't allow a CNAME at the apex (@). In that case use your provider's ALIAS/ANAME record, or connect a subdomain like www.