Unable to download boarding pass and to use this on my mobile to board my flights, as i can with apps from other airlines. So, despite having checked-in using the app the evening before, and having uploaded covid certificates and documents to Lufthansa via the app, I had to join a queue at the airport and check in properly, in-person. This was frustrating and caused me some anxiety. It made everything I'd done on the app before going to the airport completely pointless.