Hello Gerardo,
I've tested this and found that the following MAC format works with this command:
AA-BB-CC-DD-EE-FF
Please replace the colon (:) with a dash (-) in your MAC address and test.
Example:
ap310#show wireless client association-history 20-DD-9E-19-70-50
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ACCESS POINT BSSID CHANNEL BAND TIME DELTA TIME
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ap310 20-8F-F7-21-0B-40 36 5GHz 14:27:49 01/25/2022 0:01.19
--------------------------------------------------------------------------------
Association count in last 60 minutes : 1
30 minutes : 1
5 minutes : 1
ap310#show wireless client association-history 20:DD:9E:19:70:50
Client 20:DD:9E:19:70:50 not in local device rf-domain, please provide client RF-Domain
I hope this helps,
Rgds
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Christoph S.
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Christoph S.