Invitation link says invalid or expired

Yes, and there is one step you should do first: 1. Cancel the existing invitation for that email address. If you skip this you may hit a message saying a pending invitation already exists. 2. Create a new invitation for the same address with the role you want, either admin or member. 3. Ask your colleague to accept within seven days. Two details that trip people up when accepting: The person accepting must be signed in with the exact email address the invitation was sent to. If he created his account with a different address, for example a personal one instead of the work one, the acceptance is rejected. In that case invite the address he actually signed up with. And he needs an account before he can accept, so if he has never signed up he should register first and then open the link. One last thing worth knowing: if his email domain matches the domain of your organization's owners or admins, he can also request to join directly from the discovery view, and you approve the request instead. For teams on a company domain that is often smoother than chasing invitation links.