Support Chat system came back and resolved the issue with them. It was caused by incorrect VLAN tagging. Thanks!
I've got 2 Dell EMC Switches, an N2224X and an N3000. I have a fiber optic link AND a radio back-up link. Intent is that they provide redundancy using spanning tree. Both show link but only the radio link actually works. If we pull the radio link cable the fiber connection does not pick up. Radio link is between the 2 Gi ports. FO link is between the Te and Tw ports. From the N3000: !interface Gi1/0/24spanning-tree portfastswitchport mode trunkswitchport access vlan 193switchport trunk allowed vlan 193exit!interface Te1/0/1speed 1000spanning-tree portfastswitchport mode trunkswitchport access vlan 193switchport trunk allowed vlan 193exit   From the N2224X: !interface Gi1/0/24spanning-tree portfastswitchport mode trunkswitchport access vlan 193switchport trunk allowed vlan 193exit!interface Tw1/0/3speed 1000duplex fullspanning-tree portfastswitchport mode trunkswitchport trunk allowed vlan 193exit
Spanning Tree on 2 Dell EMC switches