rclone fusermount3 not found in $PATH and Fatal error: mount not ready
failed to mount FUSE fs: fusermount: exec: "fusermount3": executable file not found in $PATH
Solution
apt update && apt install fuse3 s3fs
Try and mount again with -vv command
rclone mount --buffer-size=32M --dir-cache-time=1h --vfs-cache-mode=minimal --daemon --daemon-wait=5m --allow-other --allow-non-empty -vv de1-storage1: /mnt/de1-storage1