Use parameter SearchBase to limit the search scope.
See further details below:
[ActiveDirectory] SearchBase=<string>
Limits the search scope of MNE's Provisioning Wizard to a single domain when searching a multi-domain forest
for objects. This feature prevents collisions that could otherwise occur. For example, the search finds John
Smith (JSmith) in one domain and Jim Smith (JSmith) in a different domain. For example:
SearchBase=dc=sample,dc=com
The default, if left unspecified, is to search the entire forest, as in prior MNE releases.