Shared feed completely disapeared?

The shared feed I had with a friend of mine is currently unavailable after one week of it functioning normal. Suddenly I couldn't view it and when I pressed " join the shared feed" it would tell me that it's unavailable. I have tried clearing cache, checked for updates and all, even talked with support.

I am making this post to ask.

Has anybody else have this problem?

Is there a way to fix it?

If you had it and just waited did it turn normal again?

What is the reason behind this?