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That is weird... this is another one edited to have no limits, try it out

https://discord.gg/S4ZB7kJxZa

Same result

Were you already on the server at any point? the invitation is valid so there must be another reason for it not to work

No, I'm not sure I've been on the server before now. I can't remember.

I've gained access. I copied the invite link to discord and it worked, instead of accessing from browser.