Thank you very much for the detailed explanation.
I tested the flow with a colleague who does not have a Power Automate Premium license,
and in our environment, both the Teams chat notification and the email notification did not work for that user.
I also checked internally with some experts in our organization, and they mentioned that there may currently be an issue or inconsistency
on Microsoft’s side regarding the diamond (Premium) icon and licensing behavior.
For now, we have adjusted our operational process to cover this, so not having the Teams chat notification is not a problem for our current use case.
I really appreciate everyone in the community for sharing their knowledge and insights — it was very helpful for understanding the situation from multiple perspectives.
Thanks again, and have a great day!