I opened the error code on the site saxophone and looked yes I tried to do I do not get results. "Players do not own Destiny 2, but have it installed from a Free Trial weekend and are attempting to launch outside of a promotional window. Players are attempting to launch the .exe file outside of the Battle.net launcher. Players should always launch Destiny 2 from within Blizzard’s Battle.net app. Players are attempting to launch while Destiny 2 is already running on their account on another computer. Battle.net authentication is under maintenance or is encountering issues. Players who believe this is the case should check Blizzard Support for information." These are the information I get from the site about saxophone

And? Try using a task manager to close all instances of Destiny 2. Then try again