You can try with this, go to your cloudflare dns settings and change the orange cloud to grey (DNS-only). Wait 5 min and restart BSS and check again.
Don’t forget to change the cloud back to orange when it is set in BSS
Visiting your domain shows that it reaches our servers successfully. Sometimes it can take a few hours for the domain to be detected due to DNS caching.
There appear to be some deeper issues with your domain. You or someone else has set up DNSSEC in the past, and now the checks are failing. This prevents the domain from working entirely until these issues are resolved.
You will need to contact your domain name register or look through their help documents. There is little we can do on our end unfortunately.