Custom domains won't get validate and returns an unknown error.

Amin Mahmoodian 0

Hey everyone,
I am trying to set my domains on a Static Web App, but it's been around 3 weeks that I'm trying to set my CNAME and TXT, but it fails, and I get "Validation failed" Status following this error: "An unknown error has occurred while adding your custom domain. Please try again later."

I have checked my CNAME and TXT and they are both visible publicly. Also, I have no issue with my other domains but this one is not gonna get validated.

I would appreciate any information or sharing experience to help me with this issue.

Cheers

Silvia Wibowo 5,126 Reputation points Microsoft Employee

2025-01-21T02:51:40.3666667+00:00
Hi @Amin Mahmoodian , please clarify:

Are you using root/apex domain (example.com instead of www.example.com)?

Are you using Azure DNS or 3rd party DNS?
Amin Mahmoodian 0 Reputation points

2025-01-21T15:17:55.3133333+00:00

Hi @Silvia Wibowo and thanks for the response.

I'm trying to set the root URL of my domain (e.g. mydomain.com and www.mydomain.com) @ and TXT for the root (mudomain.com) and www and CNAME for the (www.mydomain.com). It used to be part of Google domains but it's been moved to squarespace.com. I have another domain also with the same history (moved from google domains to squarespace) and I have no issue setting these domains on Azure, but this one, I have no idea why it just fails and gives me that error message.

Cheers
Silvia Wibowo 5,126 Reputation points Microsoft Employee

2025-01-21T19:58:42.3466667+00:00

Hi @Amin Mahmoodian , let's start with non-root custom domain. If this can be successfully verified, we can add root custom domain later.

Follow the steps from this guide: Custom domains with Azure Static Web Apps

Check if you have a CAA record on your DNS provider (squarespace.com). If you do, allow digicert to issue certificate by adding CAA record for root/apex domain with this value:

yourdomain.com CAA 0 issue "digicert.com"
Amin Mahmoodian 0 Reputation points

2025-01-22T07:19:21.6+00:00

Hello @Silvia Wibowo , the fact is when I start with the CNAME and www, Azure throws this error message right away:
Could not add custom domain. CNAME Record is invalid. Please ensure the CNAME record has been created.
although the CNAME is publicly available and also has been added to the DNS.

If I start with the root (@) and try to add TXT, the validation goes forever (I waited a week and nothing has happened, which is not normal as I could set my other domains without any issue).

I've added the CAA and, did set the TXT for root on my DNS and will wait for Azure to see if it can get validated this time.

Thank you again :)
Amin Mahmoodian 0 Reputation points

2025-01-27T10:39:01.1933333+00:00

Hi @Silvia Wibowo and thanks for the suggestions.
After the last comment (Jan 21st), I have removed all the configurations on both my DNS and Azure web service, I added the CAA, added a new generated TXT and confirmed that it is publicly visible using several DNS checking tools like mxtoolbox, then I waited till today and finally the validation spinner on the Azure stopped and Failed again.
The support of squarespace.com also unfortunately couldn't be helpful much. And the fact that the CNAMEs or TXTs added to the DNS are actually visible publicly, made them think that the issue comes from the Azure side.
I actually have no idea what else I should do. Is this the Azure issue, or the DNS provider's issue?

I would appreciate any help and ideas.

Best wishes

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