DominUgh

I can confirm that logging in and out of the associated Microsoft account as a workaround rewards the Mojang Office Cape.

I am having this issue as well. Reinstalling Minecraft, reinstalling the launcher, restarting the game multiple times, rejoining multiple times, and trying to redo all the challenges does not solve the issue. Attempts to contact Minecraft support about the cape will be met with an automated ticket closure on the grounds that the event is no longer accessible even if the event is still ongoing. My ticket was closed today even after providing proof that the event was completed before the ending of the event.