Looks like nothing happens when switch theme to Grey Amber.
Hi, I’ve just tested this here and the grey/amber theme is working for me.
color schema doesn’t change in my case.
it works after I go to settings and manually choose grey amber in interface dropdown, I was trying to switch through hamburger menu but it didn’t work.
Just did that. Selected three different themes then back to Grey Amber via Hamburger menu. All on iPhone.
I am on windows chrome, and it works fine for me.