If you have an existing Google account and want to access an associated YouTube account, go to YouTube.com (or open the app) and click "Sign in" at the top right. Use your Google Account email (Gmail or other) and password. If you cannot remember your credentials, use the Google Account recovery tool.
If you're looking to gain access to the account that is related to your topic channel in YouTube, please note that this is not possible. Topic channels are YouTube's way of handling the music we send them and making sure it's available to listen to in both YouTube and YouTube Music.
Topic channels allow your music to appear in YouTube Music, which is YouTube's music streaming service. Topic channels are not designed to be accessible or editable by artists.
If you want your YouTube Music releases available on your own artist channel as well as the topic channel, you'll want to request that your own channel (also known as an Owned and Operated Channel) be converted to an Official Artist Channel (OAC). For more information on Official Artist Channels, please see this article: https://support.distrokid.com/hc/en-us/articles/360036924633.
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