You can’t activate Games Pass after you cancel.
Series S | X: To receive your paid months of Games Pass, you must have activated your Games Pass before you cancel.To find out more, check out Xbox Game Pass. Note, once converted to Ultimate, Xbox Live Gold and other Game Pass memberships cannot revert. One Series: If you redeemed the Xbox Game Pass Ultimate token prior to returning your Xbox All Access, the 24 months of Xbox All Access Ultimate will be removed from your account at time of return.If you delay activation, you’ll still receive 24-month access, provided you stay connected to All Access for 24 months. Games Pass is included in Xbox All Access for every month you stay connected for the first 24 months.