It is probably prudent for a system to disallow emoji passwords
In addition, not all keyboard environments are capable of inputting the same set of emoji. A coworker once got locked out of his macbook because the UX when changing the password when already logged in allowed inputting emoji, but the OS login screen did not (could be misremembering some specifics, but the broad point remains).
Which I suppose is really a subset of the sorts of issues around ç, ö and ø, but how it can happen even on the same system in different contexts.
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In addition, not all keyboard environments are capable of inputting the same set of emoji. A coworker once got locked out of his macbook because the UX when changing the password when already logged in allowed inputting emoji, but the OS login screen did not (could be misremembering some specifics, but the broad point remains).
Which I suppose is really a subset of the sorts of issues around ç, ö and ø, but how it can happen even on the same system in different contexts.