[quote]so I'm not sure if you'd be keen on refurbishing for that format,[/quote] That is definitely the question to be decided isn't it ... [quote]I don't know how the code generation works.[/quote] By default a generated invite link is good for 10 uses and 24 hours. You can configure it to be different, but that's extra steps. Its possible this wasn't set and it expired of its own accord.