Is the user ID that's specified with the --account flag a secret?

How important is it to safeguard and keep secret one's user ID (this is the identifier that's listed to the right of your email in op account list)?

What are the ramifications of its involuntary disclosure?

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1Password Version: 2.3.0
Extension Version: Not Provided
OS Version: Mint Linux 21.3
Browser: Not Provided