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I think I know this one. For expired links, you can go to [your website domain]/my/invited/expired then click the pencil button on an expired invite to make it no longer expired by adjusting the time. You may also need to adjust the number of people as needed that can redeem the invite.

The image shows an invitation titled "link TWgP..." that was created on September 2, 2023, and expires on December 1, 2023, at 9:39 am, with a note that 6 out of 10 have redeemed it. (Captioned by AI)
The image shows an invitation titled "link TWgP..." that was created on September 2, 2023, and expires on December 1, 2023, at 9:39 am, with a note that 6 out of 10 have redeemed it. (Captioned by AI)2210×190 18.9 KB

This image shows a share screen for inviting someone to a Gimkit or similar game, providing options to set restrictions, max uses, expiration date and time, and optionally adding the invitee to groups. (Captioned by AI)
This image shows a share screen for inviting someone to a Gimkit or similar game, providing options to set restrictions, max uses, expiration date and time, and optionally adding the invitee to groups. (Captioned by AI)1214×1260 61.5 KB

Otherwise if you cannot find the invite, can you try to create a new invite link for your group then send it to everyone again by email? Just as a comment, the maximum resumptions for an invite is up to 5000 from my knowledge.