I have a form, where I use the fn-IsMemberOfGroup function together with fn-not. While working with my form, fn-not suddenly stopped working. I hope that someone can tell me what I have done wrong here, that can cause this. The first image is of the problem I see.
Here are the fields configuration:
Field one and two with their configuration shown here:
I have tried a lot of things. I tried creating another form to test, and that one works like it should:
Copying the formula from the working form to the non-working form still fails.