I have had this notice for a while: Registration is being processed for these devices. They may become available for development and ad hoc distribution in 24 to 72 hours. Changes to device availability will appear in the Status column.
The status for my new iPhone has been stuck in this "Processing" state. See image:
I also have the same issue. It appears that after 10 UDIDs, Apple now takes 24-72 hours to update new registered UDIDs. I got my new iPhone 15 yesterday and wanted to switch development to it, but am stuck waiting. As a consulting member of various companies I notice I could add my UDID to the other companies I'm enrolled as a developer with and it would immeditialy be available. But only if I had 9 or less registered devices. I did read somewhere that it's a new rule. See this page: [https://developer.apple.com/help/account/reference/device-registration-updates/).
It clearly states:
" Enabling registered test devices may require additional processing for new Apple Developer Program memberships or memberships renewed after expiration for one month or more. Although the device is registered during this time, the device identifier won’t be included in provisioning profiles until processing completes. Existing active memberships are not impacted by this change. "
So it's a new policy I guess (?)
I don't want to know why it takes 72 hours to process a device by UDID. it is just one more crazy stuff from product owners in Apple or there is a legit requirement. I found Dart/Flutter more satisfying than the Swift/SwiftUI combination and see Apple as a gatekeeper only. It might be a good idea to start making developers' lives easier rather than doing it harder every next year.
Same problem after device number goes more than 10.