Moving a Luks encrypted Volume to another Droplet

I setup an encrypted volume on one of my droplets. When I deleted the droplet I kept the encrypted volume, expecting to use it later. I setup a new Droplet and attached the encrypted volume. When I try to open the volume i get the following error:

cryptsetup luksOpen /dev/disk/by-id/scsi-0DO_Volume_volume-nyc3-01 secure-volume Enter passphrase for /dev/disk/by-id/scsi-0DO_Volume_volume-nyc3-01:

“No key available with this passphrase.”

Was there a keyfile I should have backed up before migrating the volume? I expected that I could just open the volume again by using my password.

Any help appreciated.