Do I have grounds to sue if I was denied an accommodation with a doctor note stating high risk

Your employer has a legal obligation to engage in the reasonable accommodation interactive process in good faith. Your employer does not have a legal obligation to provide you with the accommodation of your preference. Depending on the facts and circumstances, your request to work remotely might or might not be reasonable. If your employer suggested another obligation which would have allowed you to perform your essential job functions, then it would have complied with its legal obligation. If your employer refused to engage in the reasonable accommodation interactive process in good faith or otherwise failed to provide you a reasonable accommodation, and if your impairment otherwise qualifies as a disability, then you might have one or more claims under the Americans With Disabilities Act and related state law.