Can't Invite - Staff don't receive invites.

Can't Invite - Staff don't receive invites.

Hi, 

Hope you had a good weekend. 

The reason for my email is that I invited 20 users to my Zoho Pulse network. However only 4 received invites I tried to resend however no one is receiving them. 


Could you please advise what I am doing wrong. 

- I also sent an email to followup on this post.