This is on Brave on iOS:
A site is not letting me click a checkbox because it says: “You need to enable cookies in order to remember this device”. When I lower the shields (orange icon in the top right) it still gives that error message. I checked and to me it seems that lowering shields removes any restrictions on cookies.
I am using Duo for single sign on to my employer, brandeis.edu. So this is a local SSO web page but I think it is generated by Duo. It contains a button to request a push notification to authenticate, and a checkbox that says “remember for 30 days”. That’s the checkbox. This same process seems to work fine on Brave for Mac (beta).