Syndicate Medallion or Ayatans shouldn't appear in a hallway or rooms that can only be accessed by luck or just straight up inaccessible. - General - Warframe Forums
Steam Community :: Guide :: Hunting Syndicate Medallions!
Steam 커뮤니티 :: 가이드 :: Hunting Syndicate Medallions!
Warframe - How To Find Syndicate Medallions (Easy)