HTTP POST to port 8000

Using the latest rule machine version.
Trying to post to the following but does not seem to get sent from Hubitat

Its like it wont post to that port. Works fine from postman from another machine on the same network.

Any ideas?

Are you sure it isn't a certificate issue? Can you try this without using https?

I think you are correct, thank you. Looks like on the post endpoint the cert is not valid.