EDIT Reveiwing my screen shot compared to what you posted, I noticed the “in” vs “is” Operator. Perhaps “in” is the correct operator? I changed to “in” and I no longer see the error.EDIT
I can’t replicate that. Can you open a ticket and post the # here? From the email address associated with your account, email them at: support AT cloudflare DOT com
Just started in the last week or so. When I attempt to add any domain policy, this error happens. It seems to self-correct after a while of messing around, allowing me to add to the policy without the error.
It’s hit or miss. Sometimes the error goes away on create, sometimes it doesn’t. No idea how to reproduce success.
The better way to work around this in the meantime is to configure a whitelist and/or a blacklist. If you use the “in” operator you can specify multiple (or just one) domains in a single policy. This does work and it does block/allow. See example below.