I reverse my previous answer. After reconsulting with our privacy team, you should choose “no”. Consistent with prior posts from Atlassians during GDPR roll-out, Atlassian does not consider the Account ID alone to be personal data.
For your benefit and that of concern parties like @remie and @james.dellow, my prior answer was the result of a procedural problem that we have resolved internally. Thanks to your engagement here, we are keeping established policy.