Button linked to Sharepoint Library not working

Hello Community,

Hope you can help me.

I created a SharePoint site with 2 buttons.

The first button is linked to a SharePoint List.

The second button is linked to a SharePoint Library.

By using the browser the buttons work pretty well.

Then I created a new register card inside our Teams an linked the new Sharepoint site with it.

Now this is what happened:

The first button linked to a SharePoint List opens a browser and show the list.

The second button linked to a SharePoint Library show me the text - this element is no longer available.

How can I fix this problem?

Thanks in advance.