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@DanF Try settings - apps, look for clocks, force stop and clear data. Set an alarm right away to see if it helped.
@DanF One more try with: settings - apps, tap on 3 dots and reset app preferences. Note that this will reset your ringtones etc.
You could try that. Also, you can boot in safe mode and see if vibration works from there.
Download a 3rd party alarm from google play and keep us updated.