Failed to fetch subvolume detail

Hi,

Can you please tell me what I'm doing wrong?
The dryrun always shows me the error `!!! Target "192.168.1.10:/backups/" aborted: Failed to fetch subvolume detail`
The local snapshots are working OK

Server fstab for BTRFS drive and subvolume

`UUID=XXX /backups btrfs rw,noatime,compress=zstd:3,ssd,discard=async,space_cache,commit=120,subvol=@backups 0 0`

Configuration file `/etc/btrbk/btrbk.conf`:

`
timestamp_format long
snapshot_preserve_min 18h
snapshot_preserve 48h

ssh_identity /root/.ssh/id_rsa
snapshot_dir @snapshots

volume /btrfs
subvolume @
target ssh://192.168.1.10/backups/
`

Output of `sudo btrbk -c /etc/btrbk/btrbk.conf -v -n run`

`btrbk command line client, version 0.31.3 (Thu Oct 14 00:48:35 2021)
Using configuration: /etc/btrbk/btrbk.conf
WARNING: Skipping target "192.168.1.10:/backups/": Failed to fetch subvolume detail
WARNING: ... Command execution failed (exitcode=1)
WARNING: ... sh: ssh -i /root/.ssh/id_rsa root@192.168.1.10 'readlink -v -e /backups/thinkpad'
WARNING: ... [ERROR] Unrecognized command, bailing out!
Assuming non-present subvolume "@.20211014T0048" in skipped targets: "192.168.1.10:/backups/"
Creating subvolume snapshot for: /btrfs/@
[snapshot] source: /btrfs/@
[snapshot] target: /btrfs/@snapshots/@.20211014T0048
WARNING: Skipping cleanup of snapshots for subvolume "/btrfs/@", as at least one target aborted earlier
Completed within: 3s (Thu Oct 14 00:48:38 2021)
--------------------------------------------------------------------------------
Backup Summary (btrbk command line client, version 0.31.3)

Date: Thu Oct 14 00:48:35 2021
Config: /etc/btrbk/btrbk.conf
Dryrun: YES

Legend:
=== up-to-date subvolume (source snapshot)
+++ created subvolume (source snapshot)
--- deleted subvolume
*** received subvolume (non-incremental)
>>> received subvolume (incremental)
--------------------------------------------------------------------------------
/btrfs/@
+++ /btrfs/@snapshots/@.20211014T0048
!!! Target "192.168.1.10:/backups/" aborted: Failed to fetch subvolume detail
`