I can't enter (nor access) my friends' Realms.

Steps to reproduce the issue:

Open Minecraft Bedrock Edition.

Click on "Play".

Go to the "Realms" tab.

Observe that:

The list of Realms (including friends' Realms) often appears empty, or no Realms are shown.

No invitations for Realms appear in my "Invites" box.

(If the Realm list eventually appears): I tried clicking on the Realm of my friend, [duckGe].

The game attempts to connect, but after a few seconds/minutes, the message shown in the attached screenshot appears, and I am returned to the main menu.