MASTER-MESH-PORTAL# show arm config
Minimum Transmit Power :9
Maximum Transmit Power :18
Band Steering Mode :prefer-5ghz
Client Aware :enable
Scanning :enable
Wide Channel Bands :5ghz
80Mhz Support :disable
Air Time Fairness Mode :preferred-access
Client Match :enable
CM NB Matching Percent :75
CM Calculating Interval :30
CM SLB Threshold :2
CM SLB Balancing Mode :channel based
CM Max Request :5
CM Max Adoption :5
CM Debug Level :error
Custom Channels :Yes
2.4 GHz Channels
MASTER-MESH-PORTAL# show ap bss-table
Aruba AP BSS Table
------------------
bss ess port ip phy type ch/EIRP/max-EIRP cur-cl ap name in-t(s) tot-t
--- --- ---- -- --- ---- ---------------- ------ ------- ------- -----
6c:f3:7f:b7:e4:d2 TULOABE ?/? 192.168.1.3 a-HT ap 100+/18/22 1 MASTER-MESH-PORTAL 0 21h:12m:36s
6c:f3:7f:b7:e4:c2 TULOABE ?/? 192.168.1.3 g-HT ap 11/18/21 1 MASTER-MESH-PORTAL 0 21h:12m:34s
What version of IAP Os are you running ? I am running the latest 4.1.1.1 and it looks like it works