wAP with missing N rate

Hello,

My old Buffalo routed died after 14 years. I purchased an hEX and pulled out of the drawer an wAP. Things are up and running but I am missing N rate (and also bandwidth) from wAP.
From this image you can see that there are only A, B and G rates:

My basic setup:

Routerboard and FW info:

From the official specifications https://mikrotik.com/product/RBwAP2nD#fndtn-specifications n should be supported.

Speed test is of about 15 Mbps down and 9.7 Mbps up (I have a 250/10 Mbps line)

What am I missing here?

Regards.

N rates table is not under “Data Rates,” it is under “HT MCS.”

Besides, please don’t use extension channels on the 2G radio. And…do you really need 802.11b support?

Hello,

thank you guys for the advice. Of course after reading the manual I also understood it. Sorry for littering the forum with stupid questions.

Regards.