Cannot setup ECG on Fenix 8 in Germany after backdating from 13.18 to 12.35 and leaving Beta program

Hi all

being a user in Germany,I want to use the ECG feature. However it's not in the Beta. 

So I left the beta program on the watch settings, backdated to 12.35 from the 13.18 beta, removed the watch from the garmin connect app and reconnected.  Garmin App version is 5.8.1 on IOS 18.2.1. 

Still, I don't see the option to acticate the ECG App. Also not after sleeping it over (thinking that something might happen in a nightly cycle in the backend). 

Has anyone else experienced this and can point me to a resolution? 

Best

Stefan