I'm experiencing the same issue. I created a new subnet and VLAN from "Security & SD-WAN" > "Addressing & VLANs" and created a new group policy as part of the new subnet\VLAN wizard. Now I can't edit that group policy, create new group policies, or edit other group policies on that network; I receive the "Wpa version WPA3 Transition Mode is not supported on this SSID." error each time.
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