Circular instructions when configuring custom wildcard subdomain

[tim-codes]

Page to Investigate

https://vercel.com/dashboard/domains/

Steps to Reproduce

1. Configure wildcard subdomain using nameservers method
   -- added *.preview.mydomain.io in Vercel UI
   -- configured nameservers in my DNS provider -> NS record preview.mydomain.io ns1.vercel-dns.com. ns1.vercel-dns.com.
   
   -- so far so good 👍🏻

2. Follow instructions in the Vercel UI to add CNAME record
   
   -- click the "add" link which takes me to Vercel DNS records
   -- add the CNAME record as instructed
   

3. returning to the previous screen, now the UI instructs that the new record is a conflict and should change it for an A record
   

4. swapping to A record as instructed returns back to (2) state, asking to swap A record for CNAME record
   🤯

I can't find any reference in the documentation that would clear up the correct configuration here, but the circular instructions seem to indicate a bug.

Any help appreciated! 🙏

[amyegan]

Sorry you ran into this problem, @tim-codes. If you share the domain, we can look into the logs for more info on what is going wrong.

[amyegan]

Sorry for the delay, @tim-codes. The engineers are looking at it, but it's a tricky problem to solve since we have not been able to reproduce the issue on other projects.

I appreciate your patience as we work out what is going wrong for your configuration. If there is any other configuration info you're able share, I am happy to pass it along to our network team 🙇

[tim-codes]

@amyegan I'm happy to try a few more things my side but there isn't any reference configuration in the documentation. Maybe your team could provide an example of a correct configuration using subdomain wildcard delegation and I can try to troubleshoot against that? Then I can rule out user error.

[smaeda-ks]

@tim-codes We're fixing this. Will update you soon

[tim-codes]

@smaeda-ks awesome news :) Thanks so much

[amyegan]

The PR was rolled out so you will see the correct error message if there are any problems with DNS records. Please let us know if you continue to have problems with circular instructions 🙏