Did you take the protector off the lens? Read here and maybe you can find something. If it's not right I would take it back.
Congrats on getting your new Samsung Galaxy S21 Ultra Smartphone! It's an extraordinary device. As a valued customer, your device concerns are our concerns too. We're sorry to hear that you're experiencing problems with the camera lenses for your device not focusing correctly and we're here to help resolve this matter for you. We want to make sure that we're not having you repeat troubleshooting steps that you may have already completed. Can you tell us what troubleshooting steps you've completed so far? Have there been any recent changes with your new phone? (e.g., software update, new apps downloaded, etc.) - RobertC_VZW