I haven't been able to play Destiny 2 for two days now because of this error code. After looking up the nightingale error code, the only recommended actions are for consoles. I shut down my computer for 10 minutes and tried launching again but nothing changed. I also uninstalled and reinstalled Destiny 2 on the Battle.net client and that did not fix the problem either. Please let me know if there is anything I can do to make this go away!