If you do not see a sign in option for VSCO, but instead see a "Get Started" or "Create Username" screen, update the VSCO app, force close and reopen the app and then follow the steps below.
This error typically occurs when you create a new account. If you did not intend to create a new account and are trying to sign into your original account, you must use the "Sign in" option rather than any "Continue with ..." option.
Get Started screen
Tap on the Settings icon in the top left corner and sign out.
You can then sign into your correct VSCO account.
Create Username screen
Tap on the X in the top left corner to close this screen and to access the Get Started screen, and then tap on the gear icon.