Find my iPhone doesn t find itself.

Hello,

first of all I want to excuse for my English skills and any mistakes in this text - I'm from Germany and still learning

But let's get to my problem:

As the headline says, the "Find my iPhone"-App. doesn't find my devices. It doesn't even find itself:

As you can see in the top bar I'm connected to my Wi-Fi network and of course to the internet.

As an additional information I want to say that it worked in the past - but I cannot tell you when or why it stopped.

I hope you got some ideas how to fix it for me.

Sincerely,

Jörg