Align mesh to camera is also Evil.
double-click into it and learn how it works.
Re-create it in the material with just Rotate About Axis.
Rotation Axis = Object Orientation
Rotation Angle = Math
Rotation Pivot = 0,0,0 - unless you need to move the pivot to the bottom of the text, in which case - 0,0,-height of text.
Position = Absolute world position including material offsets
For angle math.
You should probably open the C++ function to read if the value to be fed is in radians or degrees.
Either way, SOCATHOA the angle from object position, to camera position.
(nodes here
Coordinates Material Expressions in Unreal Engine | Unreal Engine 5.1 Documentation)
PS:
Isn’t there a RotateAboutAxis_cheap node in the pre-made functions anymore?
IF there is, try learning off of that.