IANAL Perhaps an unpopular leading question/answer, but who owns that particular Slack account? If the company owns <ex-employee>@<company.com>’s as the login

IANAL Perhaps an unpopular leading question/answer, but who owns that particular Slack account? If the company owns <ex-employee>@<company.com>’s as the login, they own it and it’s not really “you”/“yours” ~