Did I lost it all? Can't unlock pool. (Snapshots/CLone) Panicking!

Please try to keep calm and provide a much more detailed explanation of the situation.

Which tests? How is this snapshot “on another pool” related to the situation? Is it a snapshot from tank2 which could now be useful to restore?

Bad feeling about this…

Sorry, I’m not able to parse this sentence.
Please explain again. Do you had encryption to begin with? Have you tried to add encryption to the clone?