Adding DNS records is causing Error Code 10000 Authentication Error

Hi. I have one domain name on my Shopify account. I need to add 4 CNAME DNS records, to give my Shopify account permission to send emails from an email address on that domain. I had no problem adding similar CNAME records on a second cloudflare account. But when I try adding them on this account, I keep getting Error Code 10000 authentication error. I’ve read other threads here where users had the same error, and Cloudflare tech support had to fix something to get their accounts working correctly. Can someone help me with this? Thanks!

OK, I just tried again, and everything worked fine! Go figure.