ConnectCore 6UL WIFI power level control - not implemented or not working?

We’re using a pair of ConnectCore 6UL in a product and wish to control the WIFI power level.
$ iwconfig wlan0 txpower
and
$ iw wlan0 set txpower limit
Both complete successfully, but appear to have no effect.
$ iw wlan0 set txpower fixed
fails with “Operation not supported (-95)”

I’m not sure if the commands that ‘succeed’ are just being ignored, if the driver doesn’t support power level setting, or what layer things are going wrong here.

How can I set (reduce) the WIFI tx power with the ConnectCore 6UL ?

The current driver does not support modifications to TX power outside of the test mode. This is intentional as manipulating this setting may cause a violation of FCC or other regional regulations.

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Thanks for the response. I guess I’ll just have to create my own regdb.