When you spend several hours googling why the LAN port is stuck in 10/100. Turns out the HP Pro Curve 2620-48POE switch is only 10/100. Doh! : r/Ubiquiti
How To Deal With The Cisco Unsupported Transceiver Error
Port Status and Configuration
J9150D transceiver error "Unsupported Transceiver.... - Hewlett Packard Enterprise Community