1Password Webauthn/Passkey attestation?

Hey y'all, 

What attestation does 1Password use? Web Authentication: An API for accessing Public Key Credentials - Level 3

Does 1Password support attestation at all? Web Authentication: An API for accessing Public Key Credentials - Level 3

When I tried to register 1Password as a security key for Morgan Stanley, dev tools showed the attestationObject that 1Password returned as using "fmt": "none", which MS doesn't like (none attestation format not allowed). Web Authentication: An API for accessing Public Key Credentials - Level 3

Meanwhile, when I registered my Yubikey, they used "fmt": "packed" Web Authentication: An API for accessing Public Key Credentials - Level 3.