VIAVI TestCenter: 802.11n devices are shown as 802.11ax after associating them with the AP.

Knowledge Base - FAQ

If you scan for AP's on Spirent TestCetner Application, create a profile from a 2.4GHz SSID, and force the profile mode to 802.11(n).  If you associate the client with the AP, it connect as an 802.11(ax) instead of 802.11(n).
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