Strange behavior of unison called by CRON

[Eirikr70]

Hello, I have a Raspberry Pi 4 and an ASUS laptop with Linux Mint. I use my Raspberry as a NAS, and synchronise it with my laptop, through SSH with asymmetric keys. My unison configuration file is :

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# Unison preferences
confirmbigdel = true
dontchmod = true
group = false
ignore = Path timeshift/*
ignore = Path $RECYCLE.BIN/*
ignore = Path System Volume Information/*
ignore = Path .Trash-1000/*
label = 
owner = false
perms = 0
prefer = newer
root = /mnt/7267B0E9167B0C2D
root = ssh://pi@x.x.x.x:x//nas
silent = true
sshargs = -C

It works perfectly when called directly. But if I try to call it through CRON

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@hourly /usr/bin/unison -batch RaspiNas &

it fails

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Fatal error: Lost connection with the server

Has anyone found a solution to that kind of problem ?