[MCPE-62421] Error Number -9

Workaround

We have confirmed that a message stating "Account Error" with code "-9" sometimes displays inappropriately when you open Minecraft. Here are some workarounds you can try:

Check your internet connection: fully close the Minecraft app, confirm that you are connected to the internet, and then re-launch Minecraft. (Since version 1.14.20, "Account Error -9" displays whenever you launch Minecraft while offline. The "account error" displays even on Minecraft installs that have never logged in to any account.)
Check that the operating system on your device is updated.
On PS4, do not use Remote Play. (Account Error -9" reportedly occurs when using Remote Play on PS4.)
Sign out of your Microsoft/XBoxLive account on every device other than the one you are using to connect to Minecraft.
Reset the password on your Microsoft/XboxLive account.
Disable automatic updates for resource packs in the Minecraft Settings>Profile screen.

My son cannot play the game or the worlds he has bought. We get this error: There is an Error With your Account. You Will Be Unable To Use The Marketplace Until We Have Resolved This Issue. If This Issue Persists for several days Please Contact Support."

We cannot open minecraft on his ipad pro. I have changed my xbox password just to see if that helps, switched on and off again but don't want to delete app as worried about loosing progress to worlds. Please can you fix. Not sure of the version we are on.