On your client you have chose to route via zerotier but you haven't setup a default route for your zerotier network (zerotier controller). You have just to uncheck Route Via Zerotier on your client and it will fine.

I have my local.conf set to allowdefault=0 and I have used the zerotier-cli set default to zero also.

Is there somewhere else on the client I need to turn off default routes (Linux box, no GUI interface)