Unfortunately we can’t unsubscribed from everything, although we’re improving our processes all the time.
When we can’t unsubscribe you from a sender, you’ll notice an “Action required” button next to their name. - You can check for these instances by selecting the “unsubscribed” filter and looking out for the “Action required” button.

You can read more about filtering here.
If you have any failed unsubscribes then we will show you the reason why they failed, as well as an image showing the failure if you click the “Action required” button:
For example this one failed because it requires a login, note the screenshot to the right:

If it looks like the unsubscribe didn’t work then click the “It didn’t work” button and we will show you the unsubscribe link so that you can unsubscribe manually if you like.