In my experience the "association and authentication errors" are probably caused by clients that try to connect while having a very low connection signal, therefore losing packets. With only 1 AP, the question would be what is the office layout, how many rooms etc. Also, what Reg. Domain is your network set to, as this may impact the signal level the AP is maxed out on. But: even on Europe with max power being the lowest, mostly the bad connection is due to Clients not being able to reach the AP, so turning the AP to the max (what happens if you use one of the default profiles) will not help. As you have only 1 AP, there is no option to tune the RF to get a good distribution. So for one AP: - Verify in wifi profile if channel and power is auto - Check RF interference in the RF menu, change the channel on 2.4 Ghz if this is the case - Check if 5 Ghz is enabled in RF Profile - In the profile disable the speeds below 12 Mbits - Share a floorplan for more advice. Because good RF planning starts with that.
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