You can choose to send out invitations and messages to your participants either via e-mail, SMS, or a combination of these.
Mobile numbers and e-mail addresses are used as the unique ID for each participant, so at least one of them needs to be mandatory.
You need to fill in the e-mail address and/or mobile number in each column for each participant when you import your participant list.
If you add participants manually, fill in the fields for e-mail and/or mobile number in the box before saving.
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