Dataset encryption key?

[swc-phil]

I assume that @winnielinnie would start to troubleshoot your issue with those commands:

@winnielinnie

Let’s look at the entire pool to rule out some things:

zfs list -t fs -r -o name,encroot,encryption,keyformat,keylocation <pool> | grep -v "\.system"

The history of the pool can provide clues on what happened:

zpool history <pool> | tail -n 100

You will have to copy the output from some day before the date that this started.

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Please don’t post the output as a screenshot and please use preformatted text.