That won't work. You need to produce an invite link
Didn't see any way to do that, sorry. Seems to be enabled or disabled by the discord admin, since I've seen share buttons on other ones.
OK. So since no way to get in and no response from the admin of that server, I've set up a new discord for those interested
Telegram chat is primarily a Workgroup, this can be for general chat too
https://discord.gg/xMQwQK6