I agree with the previous statement. However, I recommend physically walking into the DMV to address the issue. And by the way, if you ever get pulled over for a tag violation it will cost you $30 to $50 just to get verified that you paid properly.
It be a number of reasons. Sometimes you have to show proof of liability sometime it's a smog the was required. How did you pay for it at the field office or online or used kiosks or dropbox. Your renewal notice would usually tell if it's insurance or smog or both were required. Call the 800 number during business hours
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