Help needed to solve a ssh error with a new borgserver in an instance with an already running borgserver

My YunoHost server

Hardware: VPS bought online
YunoHost version: 11.2.4
I have access to my server : Through SSH | through the webadmin
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : The yunohost security guidelines are applied (modified ssh port, no password, modern, etc…)
If your request is related to an app, specify its name and version: BorgServer 1.1.16~ynh9 / BorgBackup 1.1.16~ynh30

Description of my issue

Hello all,
I’m trying to backup 2 different Yunohost instances (YNH1 & YNH2) into a third one (YNH3).
BorgBackup is installed on both instances i want to backup, and BorgServer is installed twice on the target server with the config provided during borgbackup install.
YNH1 backup works fine and does its daily tasks but YNH2 is always failing.

Remote: Permission denied (publickey).
Connection closed by remote host. Is borg working on the server?
Could not run script: /etc/yunohost/hooks.d/backup_method/05-borg_app
Custom backup method could not get past the 'backup' step

Can someone can help me troubleshoot what is happening there ?

Thank you

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