Oauth app webhook not working

My Oauth app is having webhook issues. Before it was working normally but now the webhook doesn’t send information anymore, when I use admin account the webhook still works but the other account doesn’t. Please support me.

I has same issue,
It not work from 2023/6/13…
url_validation is ok, but no other message…

    "payload": {
        "plainToken": "r6H4DpwWRPShMP-r7Nzwmg"
    "event_ts": 1687167253936,
    "event": "endpoint.url_validation"