Do H1b rejected cases also get a receipt number?

I have received receipt number on my new H1b filed petition through the employer but i am not able to check my case status on uscis website. The site does not recognise the receipt number I input. What could be the issue? By when does uscis give decisions on all regular processing H1b cases?

Ask the employer to follow-up w/ USCIS. This happens at times and requires a fix on USCIS side.