It is not possible to change the by default black color for signature in ADOBE SIGN (see customer service chat attached)

This is a strong requisite in some countries. If this can not be met we will need to move to other signature software that allows this option.

I see this option is already available in Adobe Reader Fill and Sign for IOS so PLEASE include this option for ADOBE SIGN since it looks like an easy fix.

If this is not possible please provide the reason to try to understand the limitation.