It appears that the link to a persona you can share with friends (found next to your persona on https://www.games2gether.com/amplitude-studios/humankind/personas) does not work correctly.

When I go to a friend's link I only get sent to the normal personas page, listing global personas by the most recent.

I can't find my own persona in global personas either (by searching or using my own link), even though I've saved it in game multiple times and I see it on the page in the top right.

UPDATE: It appears it does work, the friend's G2G name was just different than I thought and it also lists the newest personas after their persona in the grid, so it's a bit confusing. I still can't see my own profile in the list when I use the link, but that might be as intended.