Does Passport wallet support pay-to-taproot multisig?
Definitely not. Passport is an airgapped hardware wallet. So this would depend on the wallet you are connecting it to. As far as I know, Sparrow wallet is still the best or one of the best wallet that you can use with Passport hardware wallet but it is not have pay-to-taproot for multisig purpose.
I have made research on wallets that I can use as multisig pay-to-taproot but I found none. It would have been the wallet that j would have been using by now.
I think there is something off about P2TR multisig wallet. People would have preferred it as their choice for multisig but no SPV wallet that is supporting it.