I downloaded your example vbafunctions.xlsm, but no change if working with your function ( no help).

[EddieBauer17]

Is there something to do, that it will do the job?
The add-in is loaded and checked in the add-in list.

[govert]

You shouldn't need anything else. I see this:

What version of Excel are you doing this in ?

[govert]

@EddieBauer17 One thing that is a bit tricky with the function embedded in VBA is that sometimes if the .xlsm is loaded before the add-in is loaded, then the IntelliSense does not see the .xlsm. Maybe you can close and re-open the .xlsm and check again.

[EddieBauer17]

Hello, thanks for your help. I started new. Now it is running!.