Upload Failed! (401) after "Validating World!" when attempting to upload to Realms

Steps to reproduce the issue:

Step 1: Get your world file (preferably an older world file with any kind of data on it at this point).

Step 2: Click Minecraft Realms on the Title Screen

Step 3: Click on your Minecraft Realm and hit Configure on the bottom middle of the screen

Step 4: Hit Reset World and Upload Existing World

Step 5: Click on your desired world file from Step 1 and attempt to upload it!

Step 6: After 100% (and seeing that your network usage upload drops to 0% in task manager), world validation begins.

Expected Result:

The world file uploads and you can play it on your Minecraft Realm server

Actual Result:

-Upload Failed! (401)

The world file is still very functional in single player with no issues,

This is an ongoing issue now for me since the end of 2024.