Locked out
If the owner is locked out, there are two honest ways back in — there is no backdoor password, by design.
Second path: contact PhoenixOPS support. After verifying the caller's identity, support can issue a fresh sign-in invite to the owner's email — the same temporary-password invite an admin sends, never a shared or standing password.
Owners: set your emergency admin before you need one, in Company Setup under Sign-in & security.