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AlannTenn Thank you so much for reaching out for help with changing the password for a secondary user for your account. This is a change that has to be done from the Xfinity.com website. If you check out our Change password on secondary Xfinity accounts page, it will show you step by step how to correctly do so. I recommend being connected to your home network as well to help with authentication. Let me know at what step you receive the error, so I can better assist