This is the most common report we get, and it is almost never lost mail.
Work through these in order:
- Check the spelling on the invitation. Open People, or the client space for a guest, and look at the address the invitation actually went to. A single wrong character is the cause more often than everything else put together.
- Check the junk folder, and for a client, ask them to check theirs. Invitations come from a no-reply address, which some filters treat as suspicious the first time.
- Check whether the invitation expired. Invitations are valid for seven days. An expired one is not resent automatically.
- Ask the client's IT to allow our sending domain if their filter is quarantining silently. Support can tell you the exact domain to give them.
Then invite the person again from the same screen. Re-inviting replaces the old invitation rather than creating a second one, so nobody ends up with two links.
If a re-invitation also fails to arrive, come to support with the workspace name and the address — we can see whether the message left us and what the receiving side said about it.