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Historically, Brand Accounts could be used with a variety of Google services. Starting August 4, 2021, Brand Accounts can only be linked to YouTube channels and will be designated with “(limited to YouTube)." This update will not impact existing Brand Accounts, only accounts that are created after August 4, 2021.
A Brand Account is an account that is specifically for your brand. This account is different from your personal Google Account. If a channel is linked to a Brand Account, multiple people can manage it from their Google Accounts. You don't need a separate username or password to manage YouTube channels with a Brand Account