Fixing Error 43
Just wanted to share a tip on fixing error 43 that was happening to me this morning.
Go to your %AppData% folder and delete the RiotClientPrivateSettings.yaml file.
e.g. C:\Users\USERNAME\AppData\Local\Riot Games\Riot Client\Data
Run as Valorant as Admin after deleting the file.
This causes you to re-login to your account which is what fixed the error for me.