"Access denied" when accessing Google Apps Script deployed web page, even with "Anyone" access setting

Question

I have a web page deployed using Google Apps Script with access permissions set to "Anyone". However, when I try to access the page, I get an "Access denied" message and cannot access it.

appscript.json

{
  "timeZone": "Asia/Tokyo",
  "exceptionLogging": "STACKDRIVER",
  "runtimeVersion": "V8",
  "dependencies": {
    "libraries": [
      {
        "userSymbol": "Parser",
        "libraryId": "******",
        "version": "8"
      }
    ]
  },
  "webapp": {
    "executeAs": "USER_DEPLOYING",
    "access": "ANYONE_ANONYMOUS"
  }
}

Environment:

• OS: macOS, iOS
• Browsers: Chrome, Safari (both in incognito mode)
• Google Account: Only one account logged in

Steps to reproduce:

1. Create a web app in Google Apps Script and deploy it with access set to "Anyone".
2. Access the deployed URL from the browsers in the above environment.

What I've tried:

• Tried accessing with the Google account of the owner of the original spreadsheet of Google Apps Script, the editor of the spreadsheet, and other users.
• Accessed in incognito mode.
• Cleared browser cache and cookies.

What I was expecting:

The web page with "Anyone" access setting should be displayed normally.

Question

What else can I try to resolve this issue?