Windows 11 Insider Preview 10.0.22635.3212 (ni_release) is not downloading and updating automatical

Have a look at Windows Update log files and you might find out what causing this problem:
https://learn.microsoft.com/en-us/windows/deployment/update/windows-update-logs
Make sure report this issue using the Feedback Hub app.
Windows Insider is under testing and development and such issues are expected.