Sorry to see you are having issues with this.
Tentacle configuration for High availability and Octopus without the load balancer are the same to some degree.
“Listening Tentacles require no special configuration for High Availability.”
I would look at this Documentation:
This Guide here will help you with troubleshooting:
When you install Tentacle onto the Machine you are using, can you see the Tentacle installed and running?
The issues start when you are trying to connect via the Octopus server?
Also, what type of load balancer are you using so I can best guide you. Is it an AWS ELB?
Furthermore, have you checked the Firewall or routing configurations.
It would be interesting to know what happens if you go to the machine behind the load balancer, and browse to the Octopus server’s listening port directly? (E.g. https://your-octopus:10933)
In C:\Octopus\Logs on the Tentacle you’ll find some log files Could you please attach them.
I hope this information has been useful to you.
I look forward to your reply.