WD Mycloud Home not accessible

I just started my MyCloud Home. I can access via home.mycloud.com.
But when installing the Windows App (WD Discovery) I get an error “installation failed”, “please try later”.
Accessing the WD Home by IP address directly I only get a JSON anser {“key”:“notFound”,“message”:“Not Found”}.

I don’t want to share my data with the internet and want to use it only locally.
I often read that this is not ntended but possible. It’s just to login locally via IP address and deactivate remote acces. But I can’t find this option.
What can I do?