After you file

I am a Washington resident who works from home for an Oregon company. I usually get all my Oregon tax withholding refunded. This year I took out a eligible Cares Act withdrawal from my 401k and now have a large tax due to Oregon. When preparing my TT return  I called an agent and he told me the tax due was correct so I filed. Now after reading on this forum I see other experts say OR does not tax retirement income of full time WA residents. I think I need to amend my return but would definitely need an expert to help me. Would I need to amend both Federal and state?