Assuming this is an individual return, don't believe you can.  OR is a piggyback/state-only state, which means the transmission needs to be processed through the IRS.  Since the IRS' system is shut down at the moment, you will need to wait for it to come back online, probably sometime in late Jan.

Did you not get any diagnostic/error message for trying to e-file the amended OR return?

@IntuitAustin  Hi, Austin, this article seems to have been removed during the migration.  Could you please ask the Contents team to take a look?  Thanks!

https://proconnect.intuit.com/community/individual/help/ef-atlas-federal-state-ef-method-standalone-...