2sxc 9.x uses the old AngularJS UI which loads TinyMCE version 4.6 from cdn.tinymce.com. 

Since ca. November 2020 this JS suddenly shows the following message: Your access to TinyMCE will expire on 25 Februrary 2021. Please either contact your administrator or upgrade your account using the instructions available here. 

Recommendation: Just update to the latest 2sxc 11

This is the recommended method, and usually works very easily. 

Workaround: Change the URL in the old 2sxc

If for whatever reason you cannot update 2sxc, this workaround should fix the problem.

Remember that it's a workaround - so you may run into other issues. 

  1. Find the config.js file in this \DesktopModules\ToSIC_SexyContent\dist\config folder and open it in VS Code or another editor. Find line 121 which should be this
  2. Change this to switch from cdn.tinymce.com to cdnjs.cloudflare.com
    from: config.Assets = "//cdn.tinymce.com/4.6/tinymce.min.js\n" +
    to: config.Assets = "//cdnjs.cloudflare.com/ajax/libs/tinymce/4.6.7/tinymce.min.js\n" +
    This sets another CDN and also set the version to 4.6.7
  3. Delete the file config.min.js and config.min.js.map (these were the minified versions of the file)
  4. Copy the now updated config.js and name the copy config.min.js. You should now just have the config and the min file in the folder. 
  5. Test, everything should work

What about other versions: Basically the config file almost never changed - so it's probably identical for all versions of 2sxc which have this problem. So once you've done this, you can most likely just copy these updated files to all installations you have.