That’s what I reported on Tuesday in https://practical365.com/teams-loop-mesh-connect-iq-dominate-office/

Thank you. It looks like the preview of this new feature has been delayed until March 2022.

https://www.microsoft.com/en-ww/microsoft-365/roadmap?filters=In%20development&searchterms=70766

I believe you’ll be able to invite a complete team (group) from another federated tenant to join a shared channel. You can then control the membership of the team in your tenant. However, let’s wait and see what the public preview delivers.

Will this new feature allow a M365 group from a federated tenant to be added to a team in a host tenant?

i.e. instead of inviting 100 external users to my team for collaboration, can I ask an Admin in the federated tenant to create and maintain a M365 group, which will have access to certain channels in my team?

Nov 2 to 4 – https://myignite.microsoft.com/home

Although we don’t have full details until Microsoft makes its announcement, it seems likely that the initial deployment of shared channels will be limited to people who have Teams. In other words, if your tenant uses Teams, you’ll be able to share channels with another tenant who also uses Teams. All of this is subject to federation controls. We should hear more at Ignite.

When’s Ignite?