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Attendees who registered receive a QR code. Scanning it at the door verifies the registration and records the person as present, so your attendance figures come out of the event itself rather than a clipboard.

Who can scan

Scanning requires Event permission, or organisation administrator rights. This is the most common failure on the day. Somebody is handed a phone to help at the door, tries to scan, and gets an error saying the ticket is invalid or that they cannot access the page. The ticket is fine. They do not have the permission.
Grant Event permission to everyone who will scan before the event, not on the door. Permission changes are quick, but discovering the problem while a queue forms is not the moment to be editing roles.

Scanning

1

Open the event in the mobile app

Each event offers a scan action to anyone holding the right permission.
2

Scan the attendee's code

They can show it from their email or from their own app.
3

Read the result

A valid code checks the person in. An invalid one means the registration was cancelled, the code belongs to a different event, or the scanner lacks permission.
If a colleague updated the app recently and the scan action is missing, close and reopen it. The action appears after the update has fully applied, which does not always happen while the app is still open.

Attendees without a QR code

Not everyone arrives with one. Speakers, guests and anyone who paid by bank transfer may have no code because no card payment was made. The answer is to make sure they are registered for the event in the first place. A registration is what produces a code, whatever route the payment took, so add them as an attendee rather than looking for a way to issue a code on its own.

Why an attendee has no code in their email

Codes are issued for registrations that are complete. If someone cannot find theirs, check that their registration is confirmed and their payment recorded before assuming the email went missing. Re-sending will not help while the registration is still incomplete.