Issue with LINE Chatbot Rich Menu

I developed a LINE chatbot using Google Apps Script and encountered an issue while working with the rich menu. After generating three menus, I attempted to switch between them using richMenuSwitch. I am certain that the richMenuId was successfully created, but the aliasId fails to link to the existing rich menu, resulting in a "richmenu not found" error. Here is the error message:

Exception: Request failed for https://api.line.me returned code 400. Truncated server response: {"message":"richmenu not found","details":[]} (use muteHttpExceptions option to examine full response)  
createRichMenuAlias @ setupRichMenu.gs:140  
setupRichMenu @ setupRichMenu.gs:12  

Below is the code I used to connect the aliasId to the rich menu:

function createRichMenuAlias(richMenuId, aliasId) {
  let url = "https://api.line.me/v2/bot/richmenu/alias";
  let aliasData = {
    richMenuAliasId: aliasId,
    richMenuId: richMenuId
  };
  let options = {
    "method": "post",
    "headers": { "Authorization": `Bearer ${CHANNEL_ACCESS_TOKEN}`, "Content-Type": "application/json" },
    "payload": JSON.stringify(aliasData)
  };
  let response = UrlFetchApp.fetch(url, options);
  console.log(`Alias ${aliasId} created for Rich Menu ID: ${richMenuId}`);
  console.log(response.getContentText()); // 輸出目前所有的 Alias
}

I would really appreciate any insights on what might be causing this issue and how I can fix it. Thank you in advance!