const mcToken = JSON.parse(localStorage.getItem('MCToken')).mcToken;

fetch("https://net.web.minecraft-services.net/api/v1.0/grant/offer?offer=7118a7d5-240e-4f6d-8959-5269ba041938", {
"headers": {
"accept": "/",
"accept-language": "en-US,en;q=0.9",
"authorization": mcToken,
"content-type": "application/json",
"priority": "u=1, i",
"sec-ch-ua-mobile": "?0",
"sec-ch-ua-platform":"Windows",
"sec-fetch-dest": "empty",
"sec-fetch-mode": "cors",
"sec-fetch-site": "cross-site"
},
"referrer": "https://www.minecraft.net/",
"referrerPolicy": "strict-origin-when-cross-origin",
"body": null,
"method": "PUT",
"mode": "cors",
"credentials": "include"
})
.then(response => {
console.log('Status Code:', response.status);
})

没领到Minecraft15周年披风的可以用这个领取下java和基岩版都行
F12-控制台执行