When using the SAMSUNG magnetic keyboard for the Samusung Tab S9, I was experiencing dead spots when writing with the Spen. Turns out Samsung created a magentic keyboard attachement that cannot be folded backwards when not in use. So, if you are going to utilize the Spen for say, taking notes, you will need to have the whole book open. Otherwise you will have deadspots from the magnetic panel the tablet sticks to.
