Hi,
Good morning,
* I think u got it a bit wrong*
As far as i aware the stages in order to enable mesh usage in InstatAp's is:
1. connect both units (on the same lan segment - wired)
2.configure only 1 unit as VC (virtual controller) of the same VC group (not both units need to be VC!)
3.be sure that both ap's are on the same group - and 1 ap controllering the other,and then disconnect from the eth cable the 2nd(the remote point of the mesh,leave only the first unit - the mesh base unit - your main VC connected with eth cable.
4.give the 2nd unit 1-2min in order to establish mesh connectivity in 5ghz. (be sure to look in your gui - that u see both units - and walla - u got mesh
if you have further question - fell free to ask.
me.