You will be able to Reset the Invitation Link which will cause the original invitation to expire.
At that time, you can generate a new invitation link or then invite them manually.
Let us know if you have any questions about this!
Atlassian Cloud Support
It sounds like you might be running into a different issue here. I would recommend raising a new question about this, and include screenshots of your error and anything from the Confluence Server logs that comes up when you try to invite them.
Be sure to include the exact steps you took so far to try and invite the users, as well as your Confluence Server version.
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