Homey session not found

Hello, Since yesterday evening I have problems with the homey app. The app gives this message:

When I look in the browser everything works fine. If there is a connection with the app, there are usually red exclamation marks next to all devices. This is since yesterday.

The day before yesterday the internet probably went down, because I had to reconnect all bridges and devices to the wifi.

Does anyone know how this is possible?

Just out of curiosity, Rembo:
Did you follow the link below that error message, and to what info were you directed to?

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This is not because of an internet outage. Possibly your modem got a firmware update (without notice?) and got reset to default settings.
In that case, Homey shoukd be added to your wifi again, just like you had to do with your other devices.
Pro 23: press the pin for 8s but not longer than 25s.
Pro 2016-2019: disconnect the power, connect the power, and after half a minute: turn Homey upside down;
Go to Homey app and choose “add new Homey”

@Peter_Kawa It sends you to this site:

https://support.homey.app/hc/en-us

But i can’t find the solution.

I see, that’s just the knowledge base pages

I just finished my previous reply: possibly you have to add Homey to your wifi again as well

This morning i reset the homey (blue rgb circle) with a paperclip and connected it to wifi. After that it still happened. Via the app it says ‘‘session not available’’, but when i go to the browser it all works.

Owww, I missed the part it does work with the web app.

I’d kill the mobile app and clear cache:
Simplest way: uninstall Homey app, reboot phone, install Homey app

This afternoon i deleted the app and reinstalled it, after that again the same ‘‘session not found’’ error.

This evening not a single error, hope it stays like this.