You can verify this using the command 'show ap bss-table', if you look for the O/o flags this will advise if it is OWE enabled.
Flags: K = 802.11K Enabled; W = 802.11W Enabled; 3 = WPA3 BSS; O = OWE Transition mode OWE BSS; o = OWE Transition mode Open BSS; M = WPA3-SAE mixed mode BSS
Does the device in question support OWE? If you wish to disable transition mode so it is strictly OWE use the below command:
wlan ssid-profile
opmode-transition-disable
The command 'show ap association' will also show if the client has an O flag next to it:
Flags: H: Hotspot(802.11u) client, K: 802.11K client, M: VHT Mu beam formee, R: 802.11R client, W: WMM client, w: 802.11w client, V: 802.11v BSS trans capable, P: Punctured preamble, U: HE UL Mu-mimo, O: OWE client, S: SAE client, E: Enterprise client