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I'm using the owner key too and I'm getting that same error.

So you are using wrong key or master password. You can try with hivesigner.

I thought the Owners Key was the Master Password....

RIGHT, so this is all very confusing, and was never well presented in steemit user interface:

Master Key: IS MASTER and opens up all keys to be viewed in the wallet
OWNER KEY: is really not used that much usually... and I had to use my master key on steemit.com to find my owner key revealed FIRST, THEN i went to peakd.com and got the rest of my account changes done. I was really hung up on how peakd.com and hivesigner want things, owner key vs master password, but this route really helped me get all my keys changed on both sites!

Ya i figured it all out eventually lol. Initiate 1 account so far, gona attempt to change the password and then initiate an account recovery and see how that goes. I've never done it before so this will be my test ;)