No Dialogue find - Auto Transcript not working

Hey, since a couple of days Premiere Pro Auto Transcript is not working anymore. It is showing me “No dialogue found” even if there is a clear dialogue. 

I tried to change audio from mono to stereo, cleared the programme cache, deinstalled and reinstalled the programme again (as well as several times restarting) - nothing works.  Also not in the Beta Version.

I am using the Premiere Pro 26.2.on a HP Spectre laptop. My colleague with a Mac has no problem transcribing my files. 

Can somebody please help I am kinda hopeless at this point. 

Thanks!