Suddenly getting "a CNAME record with the same name already exists in this zone" via Acmebot:Webhook

[davetapley]

This has been working create for a few years, but since April 18th I get this message just after UTC midnight via the Acmebot:Webhook:

Acmebot
IssueCertificate
Reason
Microsoft.Azure.WebJobs.Extensions.DurableTask.FunctionFailedException:
The activity function 'Dns01Authorization' failed:
"The record could not be created because a CNAME record with the same name already exists in this zone.
Status: 409 (Conflict)

full message here.

We didn't make any DNS changes, so I'm not sure what's going on.

I see the same error here, but no follow up (@uniqueumang do you remember what happened? 🙏🏻 )

• Unable to create root domain certificate  #173

I would appreciate any tips on how to diagnose. Looking in Azure portal I don't know where to start, and everything looks normal on the Acmebot dashboard (although no certs have renewed since April 18th, because none are in the renew window yet.)

[shibayan]

The error message tells you that a CNAME record with the same name as the TXT record you are trying to create already exists, so check to see if a CNAME exists with the record name included in the error message.

[davetapley]

Luckily I was able to track it down by trial and error, but I don't see either the domain name, or a record name in the error which came via Acmebot:Webhook, is there somewhere else to look?