Hey,
I got a problem with the interpolations in my Font.
I set everything up with the “Insert instances” script made by mekkablue.
I know that some of my glyphs are still not ready for interpolation, but also those that are correct does’t work.
How did you set the values for your masters?
Did you have a look at the “Show Master Compatibility” option to tell you if something is off between the Masters?
Are the contours of the correct ones in the right order?
In terms of the basic setup, this looks fine. But you need to take care of the alignment zones too, which are not matching and therefore not interpolating at the moment.