I accidentally misspelled the "chertificate password" or "keystore password" in the Unlock Key section of the Android version where there is written "This key will be unlocked for one hour".
Then, for the next hour, I was unable to re-insert the password and locked with the error saying the passwords were wrong.
Shouldn't be there the ability to reinsert the passwords if wrong?
Side-Note: I only noticed it in the Android section but I suppose the same happens in the iOS and Windows Phone sections too.
In the top bar, click on your avatar (on the right) and then "Edit account". Now, click on "Signing keys". Here, you can lock your key. When un-locking it again, you can enter the correct password. You can also delete your keys here in case you don't need it anymore.