Are you sure the SSL certificate is a CA signed certificate on your side?
Please check Use webhooks and set Enable in Console
I am having the exact same issue. The "Verify" webhook URL works fine and I can see the request coming into my server:
188.8.131.52 - - [19/Aug/2019:10:24:49 +0000] "POST /webhook HTTP/1.1" 200 0 "-" "LINE-Developers/0.1"
But when I send a message, nothing is sent to the webhook. There are no access logs generated on the server.
I'm has same issue, plese help.