Note: About Discord Invite Links. ( that is not obvious, unless you know)
By default, when a Discord Link is created, it is only valild for 7 days (in the fine print).
To make it last longer, or never expire, one has to take a 2nd step, and select the option to change that 7 day life, to what you want.
Many miss this step, so when they post an Invite in, say a forum, it ends up expiring in 7 days.
Easily missed – I have done this often in the past, till someone was kind enough to point it out.
The above Link NEVER expires, ---- neither does it have a limited number of uses.