I have 25+ installs. Waiting on support to clarify what if the "original" admin account applies to installs I have transfered from another web host. Also wait

I have 25+ installs. Waiting on support to clarify what if the "original" admin account applies to installs I have transfered from another web host. Also waiting to hear if live and staging SFTP passwords need to be changed. Also worth noting that my WPEngine customer password was invalidated (forcing me to reset) however it appears SFTP, and WP Admin passwords were not (invalidated) as I can still access.