Intermec handheld won't connect to 9120AXI but will to 2702I-BK9

[dmooreami]

Catalyst wlc 9800 running 17.3.6 code (last that supports the 2702I) I have a WLAN SSID profile that if applied to a 2702I will allow old  intermec ck3 handhelds running Windows Embedded Handheld 6.5 Classic CE OS 52.29354 (Build2935415i3, 12143). 

https://www.barcodesinc.com/intermec/ck3.htm 

Yes, I know these things are older than dirt. But all connectivity is good running on the CAP2702I-BK9 access point. 

Having the wlc 9800 push out the same WLAN and SSID to the 9120AXI has the below issues:

A) The handhelds won't login to one WLAN/SSID with interface having below:

WlanA

no assisted-roaming neighbor-list
no broadcast-ssid
no bss-transition
no bssmaxidle
ccx aironet-iesupport
channel-scan defer-priority 4
no device-analytics
no dms
no dot11ax downlink-mumimo
no dot11ax downlink-ofdma
no dot11ax target-waketime
no dot11ax uplink-mumimo
no dot11ax uplink-ofdma
radio dot11a
security dot1x authentication-list AP_Auth

B) this interface they connect but can't authenticate. gettig a "unknown response".

WlanB

no assisted-roaming neighbor-list
no device-analytics
no dot11ax downlink-mumimo
no dot11ax downlink-ofdma
no dot11ax target-waketime
no dot11ax uplink-mumimo
no dot11ax uplink-ofdma
no mu-mimo
radio dot11a
security dot1x authentication-list  abc_SSIDs

[Leo Laohoo]

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@dmooreami wrote:
Catalyst wlc 9800 running 17.3.6 code (last that supports the 2702I)

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No, it is not.  

2700/3700/1570 are supported from 17.9.3 and from 17.12.1. 

I would recommend upgrading the firmware to 17.9.4 and see this makes any difference.

[JPavonM]

There are well-known compatibility issues between WiFi4/5 wNICs and WiFi6 transmitters, like the one from Intel adapters that they weren't decoding the beacons so the network was not visible until you updated the drivers to a supported version. I won't discard a similar thing with the Intermecs. I always recommend my customers to disable Dot11ax if the devices do not support that.

Have you tried to disable dot11ax on the WLAN profile?

WlanA
 no dot11ax

How come abut disabling it globally in the network?

no ap dot11 24ghz dot11ax
no ap dot11 5ghz dot11ax

Have you tried a basic Wlan profile with no PMF and/or FT? (plus the previous ones and the 'no device-analystics' you've already disabled)