After the release of s04e04, I tried again ..
Select video, audio, and subtitles as desired, add to queue and close SF.

Go to %AppData%\DVDFab\StreamFab\taskdata
and open the file HBO Max in Notepad and change
\“languagecode\”:\“de\” to \“languagecode\”:\“de-de\”

save the file and and start the queue - that’s it:

I don’t know why it didn’t work for me yesterday ..
.. but now it works also with “Movie Mode”
(play+analyze with disabled auto analysis)

btw: If you’re missing German audio for Industry.s02e03+s02e06 ..
.. it’s not a SF bug - it’s not offered at HBO Max in Germany