I think its normal,it get 17 on lower and 23 on higher channels here in EU. it has to do with antenna gain and beamforming that you have to add up. Look at te last post here https://community.meraki.com/t5/Wireless/Why-does-the-Target-Power-not-equal-the-Transmit-Power/m-p/156916 Documentation https://documentation.meraki.com/MR/Radio_Settings/EU_Compliance_Information
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