Posting this in the forums for visibility as it has potential for big impact.
As per the Meraki status page (Meraki Status), there is a requirement to rotate the Cloud Authentication certificate before August 6th if you're using Enterprise - Meraki Cloud Authentication.
This is only required if you use Meraki Cloud Authentication for WiFi Auth.
More information and steps to do perform can be found below.
Meraki Authentication Server Certificate Rotation - July 2024 - Cisco Meraki Documentation