Not much online about this issue. I was using the 3D mensuration tools on my drone2map dsm layer one day, and then the next day the tools are greyed out and won't work. I thought it might be licensing, but I have both the spatial and 3D analyst extensions enabled. Thought it might be because I moved my drone2map license to another user, but the tools still don't work now that I have a d2m license again. I've tried moving the dsm to my local C drive. I've created a new aprx and have the same issue. Seems like a bug at this point. Only thing else I can think to do is uninstall/reinstall Pro, or go to Pro 3.1 and see if that helps.