Fix Cannot Verify Custom Hostname by TXT on Cloudflare

1. Problem description

The hostname is using Cloudflare and cannot be activated with an TXT or HTTP validation token. To activate the custom hostname, the DNS target needs to point to the SaaS zone.

It means to CNAME this custom domain name to the fallback domain.

2. Solution

Suppose the fallback domain is:

callback.tsinbei.com

The custom domain name is:

custom.tsinbei.com

CNAME custom.tsinbei.com to callback.tsinbei.com and wait a minute or two for the domain status to change to "Active" in the Cloudflare console.

In addition, if the TXT verification can be used normally, the record value can be deleted after the verification is completed without affecting the host name.