I misunderstood my role cuz I skimmed too much, so this encrypted text's key is the last two words including the space of the decrypted first encrypted message (without the period):
L9Gbf3cl1QxJ7kvHnOSGeV6W2unN6KCDETWD5uVkZyPThqj0m3kIdW3vX/8vfKTOsXrv002uWimvW8Uu5x/mxz/Mh3MIV1KjWJyvVkUzseXMddwaC0yvFwFC1MwepjvQc/vh8puZvacS62KduKQLbXT6bxJ0lBlOxIUEM0+5qXuLJYdZmYJPJgmw2EfOpJKsGr6LUoxJUL87zKylEVOAicEKXSg6C9A7JPpBgeAftgY=