This looks like a useful release with several important migration caveats, especially around downgrades and configuration changes. strongly recommend reviewing the upgrade checklist and resolving any switch alerts before migrating.

Check that DNS, firewall ports, and the service account permissions are all correct. Also verify that Windows Server 2025 is supported for Cisco ISE 3.4 Patch 6 PIC agents, as OS compatibility could be the issue. The PIC and Windows event logs should...

It looks like the EVPN session is up, but the control plane isn't fully programming the fabric. Verify the VNI-to-VLAN mapping, NVE source loopback reachability, and whether Switch-B is actually advertising its local Type-3 IMET route. Also, check fo...

Try verifying your login details and the lab URL first. If it still doesn't work, share the exact error message or a screenshot so the community can help identify the issue.

Check that your sandbox reservation is active and that you're using the latest credentials from the reservation details. If the default login still fails, open a Cisco Sandbox support ticket, as only the sandbox team can reset the DNAC password.