Have learned some from reading the above, but not enough to fix my issue.
I have just switched over mysite(dot)com to Cloudflare and enabled flexible https and a page rule to force https for “http://mysite.com/*”. In the site host’s cpanel www is suppressed. Everything is working fine except for the site’s Blogger blog at the custom domain that includes www and blog before mysite(dot)com: it’s is no longer accessible. I am getting the message that Safari can’t find the server and can’t open the https page “blog(dot)mysite(dot)com” because Safari can’t find the server “www(dot)blog(dot)mysite(dot)com”.
In Blogger basic settings, attempting to enable HTTPS, I got the message that it is processing the change, but the processing hasn’t happened over a couple of days.
I then followed Blogger’s instructions to edit the Cloudflare DNS with two CNAMEs. To do this I had to delete an “A” www that pointed to an IP address. See the first and last item in the image below showing the two new CNAMES
I am still getting the same message when I attempt to open my Blogger blog page. Over at Blogger basic settings, in trying to convert to HTTPS, I am no longer getting the infinite wait for the process to complete. Instead I am getting this error message:
An error occurred (code MappingsService.Insert APP_ERROR). Please try again.
Any suggestions on how to get my blog displaying again, and being able to change it to https (although it could stay at http if necessary). Alternatively or additionally I could kill the custom domain if I could set up a redirect from it to the mysite.blogspot.com address.