Hi @Joris@binkies , the Samesite cooking patch was part of a patch that applies to app service version 86.0.7.148 and later. Your version is 87.0.7.74, so it includes the Samesite patch. Are you using SameSite=none
on your app? Is it all your users or a subset? If a subset, is there anything common amongst all of them?
You can also view https://learn.microsoft.com/answers/questions/6842/announcement-samesite-cookie-handling-and-net-fram.html for additional information about the patch.