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Invalid Frame error in AP 10 and 30

Hello All,

We have Sophos UTM 9.100-16 with AP 10 and AP30. Now adding APs to the sophos it takes configuration well but gives following error:

IEEE 802.11: handle_action - unknown action category 4 or invalid frame

It keeps on giving this error. We have only 1 interface so we have configured VLan for APs. The AP seems to be working fine as we can connect to Wi-Fi but this error still appears. We tried deleting both the APs and it reconfigured correctly still giving the error.

Please help how to resolve this error.

Thanks,
Dhyanesh

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