false alarm emails from github pages

We got three emails from github pages in March and April, saying Please verify your Pages domain (ACTION NEEDED) - "We are unable to find a verification TXT record  .... Please verify your domain within 7 days by following our instructions before it becomes unverified."

Found in each case by going to the github settings page for gh-pages, that the domain was verified OK, and the verification txt record was also fine. 

Since this has only happened for a domain which has DNS operated by Microsoft - Azure DNS - I guess the errors were DNS failures from Azure.