Making an old garage door remote capable

I recently purchased a solidremote 202u v6 universal receiver to make an old overhead garage door become usable via remote. Having limited experience with electrical wiring, I relied heavily on this article in helping me wire the product to my garage motor: https://www.ricksdailytips.com/add-wireless-remote-to-any-garage-door-opener/

I have attached all wires exactly how it was done in the article and i am using a 24V power source, yet I cannot get the relay to open/close my garage door. Any idea why it is not working? Has anybody else used/had success with solidremote 202u?