A comment or suggestion inside another one has no card of its own: its card would sit inside the other's text. Write them one after the other, or reply to the outer one.
Incorrect
To log insign inThe button says Sign in., enter your email.
To :suggestion[:comment[sign in]{note="Or log in?"}]{from="log in" note="The button says Sign in."}, enter your email.Correct
To log insign inThe button says Sign in.Or log in?, enter your email.
To :suggestion[sign in]{#sign-in from="log in" note="The button says Sign in."}, enter your email.
:comment{reply="sign-in" note="Or log in?"}