How do I connect my Snapchat? – Creator Support

Navigate to your Connect Accounts page.
Under Required Accounts, click Authenticate Snapchat Account. A new window will appear.
In the new window, log into your Snapchat account and follow the steps, including allowing the requested permissions.

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Warning: To successfully authenticate your Snapchat account, you must accept all permissions. Learn more about how we protect your data here.
After logging in and allowing the requested permissions, you should be returned to your Connect Accounts page, and should now see that your Snapchat has been successfully authenticated.