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Android 15 DP1 issues cause Google to disable OTA image downloads
They knew there were issues, but the problem has become too severe.
Google has disabled Pixel users' ability to grab the OTA imaging for its first Android 15 developer preview. A few days after the first Android 15 developer preview dropped, Google has been forced to disable access to its OTA images. Android 15's beta period will begin in April and continue until Google's expected "platform stability" in June.
Or read this on Android Central