Sharepoint Files/Folders not showing up in MCAS

[Max8512]

I've already connected MCAS to Office 365. All of my Onedrive for Business sites are showing up but only one Sharepoint site is showing up in Files list. I want to create a policy to apply a sensitivity label to a specific folder but I cannot do that because the parent folder isn't showing up in the Files list. 

Please let me know if I'm missing a step. Do I need to change a setting in Sharepoint Admin center? 

[#2]

@Max8512 we will crawl all the sites to start with. I would recommend trying to upload a few files in the folder your wanting to apply the labels in to see if it will trigger folder discovery.