Subtract Workdays

I need to subtract workdays and use the formula
WORKDAY({DATE}, -4)

This formula works perfect for adding 4 days (without the minus), but only gives an error if I need to subtract.
This should be such a simple formula but Monday.com doesn’t seem to be able to subtract with workdays attached to the equation. Can anyone help with a SIMPLE formula?

It was working before, but since a few days that’s no longer the case.

I’ve asked the support, but they said to me that’s everything’s work on their side.

It’s still strange that something that worked before no longer works now.