Not sure if this was resolved or not, but did you check for static IPs on devices? I ran into an issue when setting up the SG108E where even though I had Linux set to DHCP, it was assigning the manual entry. Rookie mistake 😞. Once I cleared the manual entries and cleared the static IPs from DHCP leases it cleared.

Yes!! I have many switches! I see this is a Cisco, so you will learn how to run a managed network using Cisco CL. Making that work with the TPLink will be fun and educational. Pretty nice!