Bitbucket won't let me use the same key pub key for two different accounts
That is bad practice indeed to have the same public key used for two different accounts.
Why don't you want to create 2 key pairs (private/public) and use them on the two different accounts?
Once it is set up, you just have to forget it. So it is not a lot of work to add.
I’m perfectly happy making multiple key pairs. I was just answering the comment question that in that circumstance it is not an option to use the same key.
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