Account recovery without 2FA

I have recently become the treasurer of a non-profit organization that uses Quickbooks. I am not listed on the Quickbooks account. The previous leadership has not collaborated with account handover and the account is tied to 2FA for a cell phone we do not have access to. All my outreach to support pushes me to send in ID etc, but that does not work because my name is not on the account.

I have access to the email accounts that the organization uses for QB, it's the 2FA to a former employee's cell number that is preventing access. I am able to send in the government corporate registry and my own ID to prove l am on the board of directors. I just need to know how to do that so the account can be updated.