Why wont the denoise button work?

Hi ​@Micayla_D8181, I'm just checking in to see if you are still running into this issue? To better help you with this issue, we would like a few more details. Can you send your system info, a screen recording of the issue, and a numbered list of the exact steps needed to replicate it? You can find your system info by going to Help > System Info, copying and pasting it into a text file, and attaching it here. Thanks! ^CH

You need to give more information before anyone could make a good suggestion. What version of Lightroom? What hardware specs? What OS? Go to ‘Help - system Info’ in Lightroom and post that here.