Adam Emerson

 I am encouraging everyone to go ahead and ask for refunds for your Realms Supscription.  Speaking with your wallet is the only way to be heard these days.

Mojang's automated email tells you that console refunds must be handled by the platform you made a purchase on. I encourage you to go ahead and file a report with Mojang so that they know why people are requesting refunds, then file a report with your respective console to get your money back.

Refund Links:

Refunds for XBOX/Windows 10

Refunds for Switch

Refunds for Playstation

Refunds for iOS

Refunds for Amazon

Refunds for Google Play

Same issue for me.  Trying to upload a world from my Nintendo Switch to the realm.  I had this issue prior to today's update and it persists now.  I have tried resetting the realm in many different ways, all to no avail.   Every time I attempt to upload my world it gets past the "Exporting World" phase and fails on "Initializing Upload". 

I did notice as others have reported that the upload manages to add the world seed and game settings to the realm, but none of my builds or changes to the landscape are carried over.