Password recovery would probabvly not work if the MSA firmware version is VL100 version.
Try the below mentioned steps:
Connect USB serial cable to the controller.
Use Terra Term or another similar emulator if USB drivers and putty serial console doesnt work:
https://support.hpe.com/hpsc/swd/public/detail?swItemId=MTX_b5a86168606e4446b10ed72b52
Controller serial number would be displayed on the log in page.
Log in name would be restoredefaults
Use controller serial number as the password.
This would reset the user accounts and password and restart managenment controllers,
If the above steps fail to fix the issue probably both controllers require replacement and HPE support should be able to help you with that.