Apple earlier today seeded the first betas of iOS 14.3, iPadOS 14.3, watchOS 7.2, and tvOS 14.3, then pulled all of the updates from the Developer Center. The betas are currently unavailable for download.
The betas being pulled could be connected to the server issues Apple had earlier today, causing issues for users trying to download and install the macOS Big Sur update. Users saw an error when attempting to install Big Sur that said: “An error occurred while installing the selected updates.”
Apple’s notary server for Mac apps also experienced issues and iMessage, Maps, Apple Car and Apple Pay were also impacted. Apple’s System Status page currently shows those issues as fixed.