Problem in Bridge with AP through wireless

I have two TP_link router one is (TL-WA801ND) attached with RB750gr2 as Access point. I want to connect an other router(TL-WA701ND) WIRELESSLY with ACCESS POINT (TL-WA801ND) . When I connect TL-WA701ND to Access point it connects successfully. But the problem is when any device or mobile is connected to TL-WA701ND router. Its not login saying “not allowed to log in from this MAC Address.
When I saw in winbox. It was showing mac address of router (TL-WA701ND) that’s why Its not log in ?
Kindly help me what should I do? To get mac address of mobile

Note: I had already disabled DHCP in (TL-WA701ND) router.
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