Fidelity is changing the OFX access for improved security, and this should be back up and running on 12/7 according to their tech support team. You might verify by contacting your tech rep at Fidelity and ask them what the 'access denied' message means, why you are receiving it, and when it will be resolved. If you learn more, please let us know.
techsupport@investmentaccountmanager.com