Blutooth connection dosen't work

Legacy versions Windows
1

I’m using the Blutooth headphones B&O H9i und it doesn’t work when I’m connected via Blutooth because the music runs much to fast.
If I connect the headphones via cable it works normal.

2

Using the same headphones via Blutooth with my Macbook everything works well

3

Had the same problem. In the audio device settings for the Bluetooth Headset I turned off Use large WASAPI I/O buffer under the low level playback options. This fixed the issue.

4

I tried turning off the large WASAPI I/O burrer as mentioned above with no result. Anyone with other ideas?