Hi!
This did help! (Strangely enough)
I only have the built in Microphone, but I went into the Audio MIDI Setup and saw that the format was set to 48.0kHz 2ch 24-Bit Integer, so I changed it to 44.1kHz 2ch 24-Bit Integer and then it started working!
If I change it back to 48.0kHz the same error appears again.
Hope this helps to find the bug somehow!
Thanks for all the work! <3