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It works like this because when Microsoft announced that EA Play would be included as part of Xbox Game Pass Ultimate subscriptions from 10th November, they also confirmed that anyone with an existing EA Play membership would have their remaining time converted to Game Pass Ultimate. It's all thanks to the same conversion trick that many took advantage of with their remaining Xbox Live Gold subscriptions. You can now boost your Xbox Game Pass Ultimate membership by up to four months for only £20 through EA Play. Don't waste your time (or money) on trying this. That brings it in line with the normal Game Pass Ultimate payment structure.
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Now, if you convert EA Play time into Game Pass Ultimate it'll only grant you two months instead of four.
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Update: Microsoft has recently made a change that prevents this trick from working.
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