GitHub Domain Verification Steps

github-domain-verification.txt

1. go to your organization settings
2. set the url under profile then click update
3. go to verified domain section and click Add a domain
4. enter the same url
5. GitHub shows you this message:

Add a DNS TXT record
Create a TXT record in your DNS configuration for _github-challenge-YOURORGANIZATIONNAME.YOURDOMAIN.
Use this code as the value for the TXT record:
YOUR VERIFICATION CODE
Note: this code will expire in 7 days.

Wait until your DNS configuration changes. This could take up to 72 hours.

6. go to your domain provider dns panel
7. click to add a new record

Record Type
TXT

Name
_github-challenge-YOURORGANIZATIONNAME.YOURDOMAIN.

Value
YOUR VERIFICATION CODE

TTL
leave it as default or you may enter 3600 

then save it

8. go back to GitHub and click Verify


* If verification fails then check every steps. Mostly when everything is correct it happens immediately.