First, either use another live account (best to create new). The second option is to change associated with the live account with that gamer tag. Can you create an offline Xbox Profile on Xbox One? While the option was available on Xbox 360, Microsoft has removed this option with Xbox One.
How to Add Your Xbox Account and Gamertag to Xbox One Xbox Live Benefits on Xbox One. Keep in mind that your previously purchased Xbox Live subscription plan will work on the Xbox One. Let's say you have 5 months of Xbox Live on your Xbox 360 Xbox One vs Xbox 360 – Is it time to upgrade? | Trusted Jul 26, 2018
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Is Xbox Live down right now? | Windows Central May 22, 2020
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How to Transfer Data from Xbox 360 to Xbox One - EaseUS Feb 17, 2020 Microsoft Gift Card - £40 | Xbox One/Xbox 360 | CDKeys Xbox One/360 Console: Load the “Home” screen (make sure you’re signed in), and navigate right to “Store” In “Categories”, select “Games” Choose the “Use a code” option; Select the option to “enter the 25 character code”, and enter the code you received in your cdkeys.com confirmation email; Web Browser: Xbox Live Gold membership good for both Xbox One and 360