① If we take TE40 as a WIFI server, and you configure the relative settings. The wifi client should connect the TE40 successfully. And you can see MAC addr in the web.
a. if can`t connect, please try to change some other channel to have a try.
b. If can`t connect, please disable WIFI hotspot then enable it again.
c. If also can`t , please try to restore the TE40 factory then have a try. Try connect other mobile devices or laptops to the TE40.
② If ①can`t solve your issue, let`s check whether the WIFI module in TE40 is ok, please enable WIFI client and connect WIFI and check the result.