get_user can’t read variable

Needs double quotes

$WhoIsUser = get_users(
  array(
   'meta_key' => 'deviceid',
   'meta_value' => "$deviceid"
 )
);

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)