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GitHub - Repository not found, deleted or missing SSH keys

As a security precaution, GitHub automatically deletes SSH keys that haven't been used in a year.

GitHub automatically deletes inactive SSH keys to help keep accounts safe, such as after someone leaves a job or loses a computer.

You can check if you haven't used an SSH key in a year by reviewing your account's security log in your GitHub account.

After your inactive SSH key is deleted, you must generate a new SSH key and associate it with your account. For more information, see this guide.

You'll also be able to find out more about the security feature in GitHub's documentation.