I can't see any domain on this service

I now re added custom domain.

Please remove and re-add the domain without modifying your DNS settings in your domain or nameserver provider.

I followed your suggestion, unfortunately same as before.

Okay, I re-kicked the TLS cert, if it fails again I will look at why the workflow failed and report back.

From our internal logs -

DNS problem: SERVFAIL looking up CAA for slashprint.io - the domain's nameservers may be malfunctioning

Looks like you have AWS domains returned in a CAA lookup, and IBM domains returned in a NS lookup, so you have something incorrectly set up on your side with the domain.

I would recommend to get your domain fully managed by Cloudflare, and then you can remove and re-add the domain.

I edit NS on AWS Route 53, removing things related to IBM and put AWS.
Can you recheck my Domain?

Removed and Re-added the domain, will check back on the progress later.

Same exact error as before, please have your domain on Cloudflare, otherwise we would not be able to assist further as this issue would be on your side and out of our control.

Okay, but I wonder I now well use other services (aprinting-backend and aladdinprintph-backend) on railway with using custom domain on AWS.

Is it related to cache about certificates?

I finally solve problem. Thank you for your support.

What was the issue?

I put wrong value on NS on AWS Route53. I could get this by your log support. Thanks a lot.

I see, glad you got it solved!

In the future we hope to expose these internal error logs to the end user so that users are able to debug this kind of issue.

For now, going to mark this as solved, feel free to re-open if you have further questions!