Do the job again and use Toyota FIPG 1281. In my opinion, FIPG is superior to a paper gasket because it can flow into any imperfections in the steel mating surfaces. If the mating surfaces are perfect, a paper gasket will suffice. Whenever it's a choice between a paper gasket or using FIPG, I choose FIPG because I'd rather just do a job once. it takes more time to apply FIPG, but it's worth it if it means you're not going to be in the situation you're currently in with either living with your 3rd member leaking gear oil or going back in and doing the whole job over again.
Toyota FIPG 1281 - (For Transmissions, Transfer Cases and Differentials)
https://amzn.to/33w0yma