When emailing an Enrol form link with read-only pre-filled fields, you can only email the primary parent. If you email 'all guardians' you will receive an error.
This is due to issues with split families, specifically, cases where we display information that has been entered on behalf of another guardian.
Forms can still be sent to all guardians, only if they don't contain read-only fields.
When sending an Enrol form with read-only pre-filled fields, make sure you choose 'primary guardian'
If you get an error on the email, you will need to create the email again and choose 'primary guardian.'