If a channel is linked to a Brand Account, multiple people can manage it from their Google Account. You don't need a separate username or password to manage YouTube channels with a Brand Account.
First, check if your channel is already connected to a Brand Account:
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Go to www.myaccount.google.com/brandaccounts. You may need to sign in first.
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Check under "Your Brand Accounts" to find your associated Brand Accounts.
- Check that you're using the right account by selecting your profile picture in the top right if you don’t find anything listed.
On YouTube, you can only use one channel at a time. Even if you have a Brand Account, it doesn't mean that you're automatically using it. Learn how to switch between accounts.