This usually occurs when certain background processes or database configurations are missing or incorrect.

To ensure invitations are picked up and processed correctly, follow these steps:

1. Cron Job:
   • Make sure the cron job is running correctly on the server.
   • If it's not enabled, the system won’t trigger the invitation process.

1. `fw_invitations.sentdate` Field:
   • If the value is `0000-00-00`, invitations have not been marked as sent.
   • Compare this behavior with a working instance to identify discrepancies.

1. Index on `sentdate`:
   • Go to the Structure > Indexes section of the `fw_invitations` table.
   • Ensure that `sentdate` has a BTREE index (e.g., `sentdate BTREE No No sentdate`).
   • If missing, add the index by referring to a working instance.

Invitations are queued, but none are being sent.
✔️ On checking `fw_invitations`, `sentdate` is `0000-00-00`, and no index exists on `sentdate`.
✔️ Compare with another working instance, add a BTREE index, and confirm cron is active.