Streams and Logstash input plugins

I cannot get the Stream to work with logstash (v7.17 or v8.5).
My logstash input is
http {
type => “auth0”
port => 9090
ssl => true
ssl_certificate => “/etc/ssl/certs/wc.tli.com.pem”
ssl_key => “/etc/ssl/private/wc.tli.com.key”
codec => “json”
tags => [“auth0”]
}
Verified this works fine by successfully accessing https://www.redacted.com:9090, get a simple page that says OK. The cert installed is a wildcard cert that matches the FQDN used so there are no cert errors.
In the Webhook Stream setup, the only value configured is Payload URL with https://www.redacted.com:9090.
I run a tcpdump on the logstash server. I see the following.
syn from auth0
syn-ack from logstash
ack from logstash
ack from logstash
fin from logstash
fin ack from auth0
The only (unhelpful) message in Auth0 is Error “message”: “Could not reach endpoint”.
To me, logstash is clearly being reached, is responding with an ack, but never receives further communication from auth0 so logstash closes the tcp session.

I started with a username and password on the http listener, same story. Now I am no authentication.
At this point I have no useful logs to troubleshoot with, nor can I find anything from others having the same problem. Any ideas?

Was this ever figured out? Seeing the same issue

Update for anyone here. You need to have the full chain of certs for your TLS certs on your webhook for the auth0 stream to work.