WizFi250 error

Dear

We want to connect 2 WizFi250 boards and we can not achieve it

Stage:
Configure 2 Wi-Fi boards as one Server and another as a client.

Module A: AP mode, 192.168.12.1, TCP Server,
Module B: Station mode, 192.168.12.2, TCP Client

[Configurations in Module A]
AT + WSET = 1, WizFi250_AP
AT + WSEC = 1, WPA2,12345678
AT + WNET = 0.192.168.12.1,255.255.255.0,192.168.12.1
AT + WJOIN

[Configurations in Module B]
AT + WSET = 0, WizFi250_AP
AT + WSEC = 0, WPA2,12345678
AT + WNET = 0.192.168.12.2.255.255.255.0,192.168.12.1

AT + WJOIN <----------------------------------- In the client module, this is where the fault is generated.

At the time of doing the WJOIN of module B, in Module A the WJOIN was already done and it is in listening mode.

Both plates had a Factory Reset at the time of the practice.

What is missing from us or where is the error?