File preview doesn't work

Good morning!
We have a problem with all the sheets. Files preview doesn’t open.
What can I do to solve the problem?

Hi,

Good afternoon!
I’m afraid this issue might come from Microsoft side preview kit, we’ve forward this problem to our development team and will keep following on it.

Hi,

We just applied an update on this and it should be working now. Let us know if you still encounter this issue.