I was able to login to Google in my full Orion profile; but thanks to (https://orionfeedback.org/d/10690-sessions-dont-seem-to-be-shared-with-ssbs-install-as-an-app), I have to login inside the site-specific browser for YouTube.
Unfortunately, it doesn't seem to support WebAuthn / FIDO2 security keys. I just immediately get this error after entering my password - it never pops up the macOS security-key prompt at all:
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0.99.132.0.3-beta
Sequoia (15)