Proton Pass is an open source, end-to-end encrypted password manager app. Create and store passwords, email aliases, 2FA codes, and notes on all your devices
As per the video they released https://youtu.be/M8doASpFbuk it allows you to immediately enter the 2FA account.. oh man. as @noodlejetski said, this very much negates the whole point of 2FA.
I really like protonmail and have been a paying user for years now. But nothing beyond calendar and mail has really made a lot of sense to me so far. I'll stick to my Keepass container, syncing that across my devices. It's easy to manage and I don't need to trust anyone else with that data ever in no way, shape or form.