Adobe Sign > Integromat Setup

Hi, 

We are trialing the Adobe sign Pro tier for a sign solution for our company. 

This is the highest tier that I can find yet I can't connect the account to Integromat/Make.

When setting up the connection I get the error 
"[access_denied] User cannot authorize application because it is UNCERTIFIED"

I have searched high on low and can't any information on connecting Sign. Even finding any API information is extremely troublesome. 

In a world where everything is connected via native integrations or services such as Integromat/ Make I can't believe a company so big such as Adobe is making the use of their API so hard. 

As it stands we won't be using Adobe Sign as a solution for our company for this reason we will be looking into other e-sign services that allow easy access to their API.