I came across an issue (bug?) where when I login to an external Yammer network, I am reverted back to the "classic" experience despite the new experience being enabled for all users.
Here's a quick summary of what I'm experiencing between two accounts across two tenants:
In this blog post, it states that external guests should be able to see the new experience if the hosting tenant has it enabled.
Has anyone else noticed this? Is there anything I'm doing incorrectly?