You can submit a support case without a customer number here: https://meraki.cisco.com/meraki-support/open-a-support-case/ - this page is designed for exactly this type of situation, where you can't get through to support in the typical ways. ... View more

Moderator commentary: Looks like there are multiple potential solutions for this problem. I'm going to highlight two of them here, to hopefully help those of you who land on this page from a search engine.   from @DeanN: The issue that I found was that Device guard was enabled on windows 11. Disabled device guard via GPO and the issue was resolved. PC had to be rebooted after the port was changed back to 802.1x.   from @meiokilo011: the solution found in our organization was to insert the certificate of the RADIUS servers via GPO for wired clients, and in the connection profile, mark both servers as trusted ... View more

Maybe related to this other thread - follow there! https://community.meraki.com/t5/Dashboard-Administration/Multiple-issues-offline-clients-unresponsive-dashboard-spanning/m-p/264704/highlight/true#M9872 ... View more