Adobe sign not working with outlook

I use Adobe Acrobat DC from my creative cloud account documents out for esign.

As from yesterday the signature request email that I send round my work place (workplace using Microsoft outlook) no longer receive a link to the document to sign.  

I have now tried to send the esign document to my personal gmail account and it works fine.  

Our IT dept have looked into all of this and are absolutely baffled by it.  So am I.

I have attached and image of the esign that is sent to my work.  Note that the blue blutton to click on is missing.

Help on this would be much appreciated as my sign documents are really stacking up.!!