My church purchased a full line of TP-Link devices to build a new network.

ER605 (TL-605R)

OC200

2:  TL-SG2008P (one switch is in the church office, the other is in the audio/visual control room)

The switch in the audio/visual control room is a VLAN.

The issue I am having is the computers plugged into the switch do not see each in Network Discovery.  The computers are the same model (ordered at the same time).  The only difference is one has already upgraded to Windows 11.  A friend works with computers and teaches computers worked to map a folder between the two last week.  He said the computers see each other on the command line but not Network Discovery through File Explorer.  He got it done, but the folder quit working.  These two computers saw each other before the VLAN was set up.

I emailed small business help.  So far I have received a manual on how to set up a network.  Today I was told it might be a firewall.  With the Windows firewall off they did not see each other.

Any help would be much appreciated.

C.Ashley