I can see the case (and the duplicates that have since been closed).
However we cannot open it - we are just redirected to a page displaying "Error: invalid case".
FYI this is the URL of the link to the case: https://extremeportal.force.com/ExtrCa...
The case management website does not recognise any of the serial numbers of our switches and then sends us to a 404 page anyway. Is there another way to create a ticket?
Serial numbers: 1520N-44732 or 1511N-4073