I would like to create a superuser whose credentials will be used in the CMP connection string.  

I see this error while trying to create a superuser.  I tried `all` & `any` in the `Policy combination` section.

> The operation causes a violation of a unique constraint on at least
> one of the properties: for property define by..

[![enter image description here][1]][1]

Not sure of the version, but the Sitecore Connector for Content Hub being used in v4.0

**UPDATE:**

I was trying to create a user with name `sitecorecmpsyncuser`.  
I tried `sitecorecmpuser` and it worked.  

  [1]: https://i.sstatic.net/1CToo.png