No sound when playing Internet content via Chromium

Hello,
after updating to the latest FW FydeOS v15.0 (Raspberry Pi 400 release version) Platform 14695.91.15.7 (32-bit), there is no sound when playing Internet content via Chromium - for example YouTube, Spotify, etc.
When I start the video from the disc, the sound is working.
The sound settings are fine and I really don’t know how to fix the problem.
Can you help me, please?
Thanks.

Petr

Not sure of what this means, did you mean local files? It’d be helpful if you could share a bit more info regarding how your Pi is connected to the sound device