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Error: Permission to user/repo denied to user/other-repo

This error means the key you are pushing with is attached to another repository as a deploy key, and does not have access to the repository you are trying to push to.

To fix this, remove the deploy key from the repository, and add the key to your personal account instead.

If the key you are using is intended to be a deploy key, check out our guide on deploy keys for more details.