Embed Code does't work after latest update 2024

Hi,

I re-activated the Option to use the embed-code for sharing the Web-player. It works on the same homepage as the podcast is hosted but only in Chrome/Chromium and not in firefox (didn’t test other Players). On other Websites it doesnt seem to work at all. It says " Fehlende Medien Dateien
Die zur Verfügung gestellte Konfiguration ist fehlerhaft. Ohne Mediendateien kann der Player nichts abspielen."

Can anyone help? Thank you!