QR code will not dispaly properly on our network....

QR code will not dispaly properly on our network....

Anyone have issues where the QR code will not display in the Enrollment Invite?  We made some changes awhile back on our internet due to an attack and now we are trying to get it to display properly.  We have added everything we think we need to the firewall but it wont display the QR code.  I can go to a laptop on the open internet and it will display in my Outlook fine.  What are we missing?