I got the same reply on my webform query.. "Your file is currently under review and requires additional verifications. As a result, the assessment period will be outside of our posted processing times." I am so confused as to what's happening.. ordered GCMS notes and got the notes in August but notes section looked fine. My AOR is 18th Feb 2019. Any idea what does "additional verifications" mean!
This is not asking an update on your file. They may have queries that they need to investigate internally further. As long as they don’t ask you specifically what is needed, you don’t need to provide anything.