That's what I was expecting as well and that is always how it's behaved until this week.
Just to check my own understanding, when you say having ADE set up in Configurator properly, you just mean the Meraki enrollment URL in Configurator preferences, right? Maybe deleting the enrollment URL from the settings and retrying it will yield something.
We did just renew our Apple MDM Push certificate last week, but there are still hundreds of devices that are taking the enrollment just fine, but on a different Configurator station. Not sure what's going on here....