Changes since SOA version
IXFR is a zone transfer request that returns changes since a specific SOA version. Enter the SOA version to request changes since then.
Not an apex domain
The domain dr7aa7a2f4f44111eb92400ae8e3c0d1f7.lc-dataroom.de is not the root of its zone.
Instead, try zone transfer on lc-srv.de .
Instead, try zone transfer on lc-srv.de .