If 'Sorry request cannot be accepted. Local copy is available' appears it means that there is an available 'local' copy at a library on the same campus where your pick-up library is based. You can request items to be brought from a library at a different campus, or request items when all copies are out on loan.
eg, If you're based at Camperdown it is possible to request library items from the Nursing,Health Sciences, and Conservatorium of Music libraries for you to pick up.
If all copies are out on loan, at any library it is possible to request the next item to be returned and held for you at any library for you to collect. (For more information refer to https://library.sydney.edu.au/libraries/requests-and-recalls.html )