Point to check Solution
Did the administrator enable the [Disabling of Duplex] setting? The paper folding function cannot be used when [Disabling of Duplex] is enabled in the setting mode. Check with your administrator.
"Setting mode" → [Device Control] → [Disabling of Duplex]
Are you using a paper type that has a specific front and reverse side? The folding function cannot be used with pre-printed paper, letterhead paper, or other paper that has specific front or reverse sides.
When folding paper, use a paper type such as plain paper that does not have specific front or reverse sides.