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Sign in again in Settings → Account, next to Try again when the login has failed: it drops
the app's own copies of the login and opens YouTube's sign-in page in the browser the login is
read from (the system's default when that can't be told, such as a Firefox profile by path).
Sign in there, then press Try again. A hint under the buttons says how to clear a browser's
youtube.com and google.com cookies when signing in keeps failing; the app can't clear a
browser's cookies itself.