Is it automatically rebuilt? Or how can I set up a new one?
Welcome to the Cloudflare Community. 
I’m not sure what you mean by your default domain key. If you are referring to an API token, you will need to make a new one.
If you are referencing a DNS record that you mistakenly deleted, you may be able to recreate it using data from your audit logs.
Turns out it was created by Google when i switched to Google Workspace for email.
I have managed to create a new one. Thank you.
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That sounds like your DKIM record. I’m glad to hear that you were able to recreate it.
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