I purchased a handful of RB711-5Hn-M's some with lvl3 and some with lvl4 licenses.

All RB711-5Hn-M's with level3 are missing the wireless interface, while all level4s are fine.

Is there a known problem?

Upgrading the RosV5rcxx does not resolve the problem.

please contact support@mikrotik.com about this problem. And include the support output file from that board.

Pls login thru winbox using the IP address and not the MAC address. u will see the wlan interface and u might need to enable them.

Turns out I just needed to open a new terminal and do:
/system routerboard upgrade

Firmware was not apparently at a level so as to recognize the onboard wlan interface.

It is happening also to me!!!
I have several RB711 board where I can not see the wlan interface.
It happens on brand new boards, already at the first boot I can not see the wlan.
I tryed to do a system routerboard update
but nothing changed.
Any other suggestions?

contact support as suggested above