This is due to "ProtectHome=yes" in the .service file; the workaround is to add:
[Service] ProtectHome=no
In e.g. /etc/systemd/system/fstrim.service.d/allow-home.conf
This is due to "ProtectHome=yes" in the .service file; the workaround is to add:
[Service]
ProtectHome=no
In e.g. /etc/systemd/ system/ fstrim. service. d/allow- home.conf