I'm booked for EWR-LIS in business next month and I'm unable to change my seat assignment online and I can't even find the option in the app. Online I can pull up the seat map and select which seat I want, it even allows me to hit the save button. However it never actually saves my selection, I've tried with multiple browsers and it's all the same. Anybody run into this issue before?

In LIS I'll be connecting on another TAP flight to LHR, same ticket, will I have to claim my baggage in LIS and recheck it forward to LHR? And I assume it'll be the same procedure in the reverse, LHR-LIS-EWR.