when trying to start a Minecraft realm I get the error in the attached picture.
"your purchase succeeded, but we couldn't create your realm right now. we will create your realm as soon as possible. check back later on this device"
it charged my card, and after half a day it still has not created the realm.
This is usually a temporary issue and should be resolved within 24 hours. If it ws not, please contact Mojang Support at: https://help.mojang.com/customer/portal/emails/new
They will be able to help you with your specific purchase.