Just a general comment. I'm seeing quite a few people here with the comment "followed spaceinvaderone video, it doesn't work".
Perhaps you should ask him for support, maybe there is an issue with the directions there.
If you use the default template as is, and follow the directions we provide in the readme (linked in the first post here), it works. I've been using it for years. It only once crapped out on me during an image update, I restored from a backup and it worked just fine since.
Also keep in mind that when you update the image, it has to connect to the openvpn-as repo to download the package. If you have networking issues (dns config, mtu issue, or something like pihole blocking it) you'll see in the logs that it is unable to connect to the repo.
To ask for support from us, post your docker run, and a full docker log on pastebin or the like and drop links here. Also let us know how you're trying to access it (the address) and what settings you changed in the gui. "I followed X guide and it doesn't work" is not going to get you support from us.