Thanks John,
the remote enrolment works fine, but in general it is not a good solution for us (to many students and courses), so a trainer (as an MNet authentificated user without being an admin) should be able to enrol other MNet authentifcated users directly (as usual).
For now we decided to go back to LDAP-Logins in both Moodle installations, so there are local users in both systems with an unique authentification source.
Moodle networking (MNet)
Enrol MNet authenticated users
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