Hi, A little more detail since I just had to do this myself...
When setting up the property:
I have the same issue and i have looked for a way to fix it all day. Doesn't matter what I do it doesn't want to vinculate my Google Analytics account with my online store. What can I do? I have already tried creating another Analytics account but I find everytime the same issue. Maybe its something I'm doing wrong but I have checked several times the instructions that are on Shopify and I think I'm doing correctly. What can I do?