Hi Kevin,
Microsoft Power Automate in this integration example is here to simplify the connection between WorkflowGen and Teams. The other solution is to use the Microsoft Graph API (https://developer.microsoft.com/en-us/graph), we have done integration examples with other Microsoft tools (Integrate WorkflowGen with Microsoft Office 365).
According to the Microsoft FAQ, only the free Power automate version does not include premium connectors.
Power automate is included in the most Microsoft 365 Plans, so with premium connectors.
In that case, a plan with Power Automate is a prerequisite, I will add it to the topic.