Yes, all are running 1gbps and I’ve even went as far as rebooting the switches. Cycling the port made no difference.
I’ve also ran cable tests with no issue, vlans match according to CDP/LLDP.
From the furthest away switches perspective this link is its uplink but that shouldn’t make a difference surely?
Honestly can’t see how this is such a pain to set up.
Beginning to think that the no entry icon/message over the port is a bug in the dashboard but I’ve no way to check other than the port is up but is passing minimal traffic according to the dashboard, which is contrary to what the error suggests.