Google Nest (mini) and chromecast devices unavailable /not found

Hi,

Some of my Google Nest and Nest mini and a Sony with built-in Chromecast and Samsung Soundbar with Chromecast are unavailable. While a few of my Google Nest (mini) devices work.

All the Nest/Chromecast devices are controllable wirh their own apps and have Internet. They were restarted a few times.

I have restarted Homey itself, has latest firmware. Have restarted the original Google Chromecast app on homey, is als the latest version. I have removed one device, cuz I thought maybe then I can re-add them, but now the device cannot be found. Strange that some device work perfectly.

How can I repair the unavailable devices? I am lost..