Cause:
System does not allow to invite an user when the following error occurs ‘User Invite Validation’ or ‘There is a problem while validating invite request. Please try after sometime.’ when there is problem while validating invite request using email-id / mobile no.
Remedies :
Users need to ensure correct email id or mobile number which validates the invited user. For invitation menu to go to : System -> Administration->Access Control -> User Invitation For more details of how to send an invite please read the below link FAQ: