From the comments, there is some confusion about why did i attach my personal email to a company account. That was not the case, let me clarify it. I created my personal account long before Trello was acquired by Atlassian. It did not have any SSO at that point and the login was with username and password. At some point, while working on a side project and to share it with a teammate, I attached a secondary email to…
Wow, their response is atrocious. It's basically just "Yes, that's right, there was a second email address attached to your account and the owner of the domain for that email set up SSO, so they now own your account. Try asking them nicely for it." I started disentangling myself from Atlassian products a few years ago but I was still using Trello. Clearly that's going to have to stop.
No work stuff is hosted in my personal accounts, and work accounts are always created with a separate e-mail. I can just remove myself from everything work related without touching anything personal.
While I was working with a small group, we had our own domain and e-mail addresses as a perk. My relationship went sour with the lead of the project and, as a power move, she disabled my e-mail and other accounts related to that group, guessing that a lot of stuff is connected to this e-mail (since the domain was prestigious in that circles) and doing so will hurt me a lot.
Since only things related to the group/work was on that e-mail, literally nothing happened. I just broke off cleanly from the group and, a move designed to hurt me brought bliss to the parting process.