AX3000T - regdomain limitation question

When I set regdomain to RS on my ax3000t I get this message in the log: cfg80211: Invalid regulatory domain detected: RS

Is this hardware limitation?

when I set regdomain to RS on my r8000 which have brcmfmac don't get error...

with US regdomain ax3000t don't print this error...

same openwrt version running on both ?

not sure, will have to check when I get home... but both are very recent snapshots... r8000 is maybe late december and ax3000t is last week updated...

I almost never change anything with wifi setting, just ssid and password but recently I had problem that my wifi keyboard for tv box died, so I installed some app on my cell phone to use it as remote for tv box... and it didn't worked... tried troubleshooting with chatgpt AI and figured that my phone is on 2,4 openwrt and tv box prefer 5ghz on openwrt... althought 2,4 and 5ghz are bridged on owrt (br-lan) somehow multicast IMHO doesn't work between bands... and chatgpt AI suggested to set regdomain... still didn't worked but now I see this error so wondering is it hardware limit... It would be interesting if someone has ax3000t and just try to change regdomain to RS... just curious...

I update
ax3000t to OpenWrt SNAPSHOT r28656-761b244964 / LuCI Master 25.021.30653~d889c27

and r8000 to OpenWrt SNAPSHOT r28646-42a253c7e8 / LuCI Master 25.022.53582~31fec23

and both had regdomain error for RS... I change it to 00 WorldWide but wifi died... so I reverted to driver default and everything is ok now:)