5GHz works for me
iwinfo phy0-ap1 ass | grep TX
TX: 180.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 1 78609 Pkts.
TX: 360.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 2 4237 Pkts.
TX: 180.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 1 174349 Pkts.
TX: 360.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 2 5602 Pkts.
TX: 360.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 2 277530 Pkts.
TX: 360.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 2 339514 Pkts.
TX: 90.0 MBit/s, VHT-MCS 2, 40MHz, VHT-NSS 2 15353 Pkts.
TX: 324.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 2 10960 Pkts.
TX: 180.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 1 11618 Pkts.
TX: 240.0 MBit/s, VHT-MCS 5, 40MHz, VHT-NSS 2 325863 Pkts.
TX: 180.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 1 17648 Pkts.
TX: 360.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 2 1631 Pkts.
TX: 180.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 1 1290 Pkts.
TX: 180.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 1 2938 Pkts.
TX: 360.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 2 319 Pkts.
TX: 180.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 1 405 Pkts.
TX: 180.0 MBit/s, VHT-MCS 8, 40MHz, VHT-NSS 1 23435 Pkts.
TX: 300.0 MBit/s, VHT-MCS 7, 40MHz, VHT-NSS 2 6 Pkts.
TX: 90.0 MBit/s, VHT-MCS 2, 40MHz, VHT-NSS 2 383 Pkts.
TX: 240.0 MBit/s, VHT-MCS 5, 40MHz, VHT-NSS 2 95 Pkts.
MIPS: machine is TP-Link EAP225 v4
SoC: Qualcomm Atheros QCA956X ver 1 rev 0
DISTRIB_DESCRIPTION='OpenWrt 23.05.0-rc3 r23389-5deed175a5'
ath10k-board-qca9888 - 20230804-1
ath10k-firmware-qca9888-ct-full-htt - 2020-11-08-1