Directly from Ignite 2019 – Data residency for Yammer

According to the following link, the following features are not available for Yammer networks in the EU Geo: External guests can’t participate in your Yammer Enterprise network. Your users can’t participate in other Yammer networks, including external networks. Your users can’t be participants in external messaging threads or add external participants to threads in your Yammer Enterprise network. External groups can’t be created in your Yammer Enterprise network, and your users can’t participate in external groups belonging to other networks.

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