"Contact administrator" error when trying to request signatures

Hi,

I'm trying to send out a PDF for signing but I am getting to 72% in the app when I click to specify where to sign. When I try via the https://acrobat.adobe.com/link/home/?dropinId=verb-sendforsignature link I get "Contact administrator".

Our administrator is on holdiay (and is no more of an expert on this than I am, so I don't expect will be masses of help when she returns). 

Any idea what is going on/is it something I can fix? I was successfull in sending out for sigs a few weeks ago.

Thanks,

J