Error message 'an error occurred while sending invite code'

Ensure that the employee has a valid email address (and mobile phone number if you also send invites by text).
​
A special character cannot appear as the first or last character in an email address or appear consecutively two or more times. The most commonly used special characters are the full stop (.), underscore (_), hyphen (-) and plus sign (+).
​
Add or correct the mobile phone number/email in the integrated product if necessary before checking that this has synced to Access PayWise+ and re-attempting to invite the employee.