They are the same links. They do not expire and can be used infinitely:
- https://discord.com/invite/SwpQUFWreW
- https://discord.com/invite/ZQdqSMSbBN
- https://discord.com/invite/exxxDPmQmw
- https://discord.gg/dhC6H5BPJm
If the link appears invalid for you, the issue is on your side, not the invite or the server.