Asking Access Key for UIBB Config

Hello Experts,

    I am new in MDG. I have one query on MDG UI configuration i.e,

There was one customized Data Model created by different user (Not me).

I was trying to create one UI modeling respect to that customized Data Model (Created by other user).

While creating New configuration of UIBB, it asking me Access Key for Object Registration. Please find the below screen shot.

My questions is: Is this happening because I am using customized Data Model created by other user to create UIBB configuration or something else?

I tried with the same key which is population under my Username as Access Key for Registration of Object but it’s not working.