Hello Frank Jestädt,
After reviewing the logs attached we found that the certificate seems to be stored in the in an account other than RCSUser NetworkService where you are trying to retrieve it. So you cannot find the certificate because it doesn't exist on that account. So you have a two options, basically safe the certificate into the ajesta-fr account or log in into the RCSUser NetworkService account and find it there.
Hope this makes sense
Jose A.