Zone transfers to Synology DNS server

Hi!

I am currently setting up my Synology DNS server to transfer my zone “xyz” to be used as a slave zone.
I have sucessfully setup the TSIG key.

However, the log says:
zone xyz.dynv6.net/IN: Transfer started.
transfer of ‘xyz.dynv6.net/IN’ from 95.216.144.82#53: connected using 192.168.10.2#57607
transfer of ‘xyz.dynv6.net/IN’ from 95.216.144.82#53: failed while receiving responses: end of file
transfer of ‘xyz.dynv6.net/IN’ from 95.216.144.82#53: Transfer status: end of file
transfer of ‘xyz.dynv6.net/IN’ from 95.216.144.82#53: Transfer completed: 1 messages, 0 records, 34 bytes, 8.044 secs (4 bytes/sec)

Any idea what’s wrong?