This network printer pulls paper just fine while photocopying, but when I try to scan, the scanner light does not come on and the paper never gets pulled. Same thing from the glass. The only thing I see is the envelope icon and the status bar to the right of it which keeps going. Nothing else happens.
Unless a fault code is generated, or you see a message at the upper left of the screen that we can go from there is not enough to go on.
With that in mind, run a Software / Network Reset and try again.
This is done at the copier by logging on as the admin, select Machine Status > Tools > Troubleshooting > Resets and choose the option that resets both (No settings will be lost) then try a scan.
If that fails, update the firmware to the latest, see if that fixes it.
If all fails, you likely need somebody onsite to troubleshoot.