I think I have an mistake of thinking by setting up my Master and Instance in my font.
I have two masters and i created from them two instances by “instance for each master”. Setting up Style name, Instance name and Family name which is defined 2 times (Font Into tab and instanced tab).
The export results in a font which has the family name also included the instance name, so my two instanced are not the same family. Seeing this e.g. on FontForge it shows the Family Name as “TeleIcon Outline” and the second file “TeleIcon Solid”. So the result is not as intended.
I’m very confused. Hope somebody can help