WAC510 WPA3 and Enhanced Open Failure

First, I would like to thank you for your reply and your curiosity regarding this issue..  Migrating to the netgear business thread would be fine..  Though, as for your question.. 

"Amazignly flawless here - being plain OWE or with OWE transition mode, WAC505, WAC510, WAC540, ... (admit all Insight managed) and plain AP mode (but with several VLANs)."

This is a fresh AP of which I have around 80 at my disposal for multiple sites..  This one is not insight managed..  I am glad that they are flawless for you in insight mode with several VLANs..  I have many myself that have employed though VLANs are not my issue..  My problem is OWE and WPA3 failing miserably in a single SSID test.

"Ref. sharedsecret - you can (and should) always provide your own key, including iOS 14.4.1 and iPhone 8, 10, ..."

This is not a production AP and I always change my keys for any production device..  This is a simple test of OWE and WPA3 on an available AP I have for testing..  I would never leave "sharedsecret" as any form of legitamate login beyond this troubleshooting.. This particular failure is in regards to WPA3 personal and OWE failing in a basic standalone setup.

"What iPhone and iOS are we facing here?"

We are facing several devices..  Iphones running iOS 14.4.1, Windows 10 laptops, and various android devices..  I have uploaded some public images to reveal the AP setup and prompts presented by a couple devices..  This indicates the undesirable behavior..