Unable to send document, Operation Failed

While customer facing, we use adobe acrobat APP for IPAD to create our contracts and adobe sign APP for IPAD to have them signed. As of last week, the APPs have stopped consistently communicating. We have been using the apps for the last few years without issue so something has changed. We have deleted all apps reinstalled. signed out and signed in and updated the iPad IOS and apps. nothing has resolved the issue. We are able to fill in the document in acrobat, and then send a copy to sign, however when sign is attempting to render/build the contract it fails and notes " unable to send document, Operation Failed"