TeamViewer on Android doesn't connect with WiFi network

Hello,

When I start TeamViewer on my Samsung Galaxy A5 2017 (SM-A520F), the app tells me that there is a connection problem. It only happens when I connect to my WiFi network. In 4G LTE, it works !

Can not connect to a device wich is ID.

This problem also affects my Samsung Galaxy TAB4 tablet.

This Problem only appears for a few weeks. Bofore, it worked.

I uninstalled and reinstalled the app, it doesn't change anything.

Thank you,