Can't live migrate instances: Permission denied

[Isa]

While trying to migrate an instance in the command line, there isn't any error in the output, but the instance doesn't migrate. Here is a snippet from the syslog of the source compute node:

Unexpected error while running command.#012Command: scp -r node8:/var/snap/microstack/common/lib/instances/26eebd86-8b74-4cf9-9104-a10d02245578/disk.config /var/snap/microstack/common/lib/instances/26eebd86-8b74-4cf9-9104-a10d02245578#012Exit code: 1#012Stdout: ''#012Stderr: '/usr/bin/ssh: Permission denied

Control and all compute nodes can access one another with their hostname. Password-less SSH is enabled on the source and destination nodes. The control node and the destination compute node can access the source node with their public key. Running the same command as root on the control node and on the destination compute node downloads the file successfully.
Full log: https://pastebin.com/4xWEuhKF
The underlying OS: Ubuntu 22.04.2 LTS
Microstack version: ussuri