I tried to checkout but no shipping methods appear and I can only choose Australian provinces… (on mobile)
I’ve seen some plugins adding suffixes to shipping methods, i.e. advanced_shipping_2 and in that case our plugin doesn’t recognize the method anymore. Does limiting certain shipping zones help in your case? v3.1.4 of our plugin allows including/excluding shipping zones.
The next release (3.2.0 probably) will have some more improvements around shipping methods allowing you to EXCLUDE all methods but Advanced shipping, if you wish I can send you the development version to try it out.