Passphrase for LUKS encrypted partitions asked twice during boot

General system Kernel, boot, graphics & hardware
6

I did exactly this:

cryptsetup luksAddKey /dev/mapper/luks-ed616353-6a2e-4003-93fe-13b7e931c04d

and “added” (?) the same passphrae. I am still asked for the passphrase, for this very partition. What am I doing wrong? Or, what is next to check?