Internationally, this was a time when "free trade" was in disrepute. The great powers not only jealously protected their special economic rights within their colonies and spheres of influence, but sought to bolster their sagging economies through high tariffs, dumping of goods, and other trade manipulation. The Japanese, with few natural resources, sought to copy this pattern. They used cutthroat trade practices to sell textiles and other light industrial goods in the East Asian and U.S. markets, severely undercutting British and European manufacturers. They also developed sources of raw materials and heavy industry in the colonies they established in Korea, Taiwan and Manchuria. Japan used high tariffs to limit imports of American and European industrial products.
The Japanese military faced a particular tactical problem in that certain critical raw materials — especially oil and rubber — were not available within the Japanese sphere of influence. Instead, Japan received most of its oil from the United States and rubber from British Malaya, the very two Western nations trying to restrict Japan's expansion. U.S. President Franklin D. Roosevelt's embargo of oil exports to Japan pressured the Japanese navy, which had stocks for only about six months of operations. Columbia.edu
Almost every source is scarce in details, but the fact they only got oil from two sources seems to suggest some colonies didn't allow other countries to buy oil from them severely limiting growth for countries without raw natural resource access.
Could Japan buy natural resources from European colonies before WW2? I am wondering if Japan could buy natural resources from their colonies and if not I am wondering if there was any support for liberalizing market access to other non-Imperial countries and if there was any progress made on that front during that time, because if it's the case, then I don't understand why Japan wanted colonies for itself.