Sending Microsoft Teams messages via WEBCON (MS Graph Delegated Permissions needed)

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I would like to create messages in Teams channels and 1:1 chats automatically through WEBCON. Unfortunately, I get the error that delegated permissions and no application permissions are required for sending (intended for migration purposes only).

I have already implemented the connection using MS Graph and the associated application permission as follows:
https://community.webcon.com/posts/post/integrating-ms-teams-with-ms-graph/53/4

Microsoft Learn Documentation: https://learn.microsoft.com/en-us/graph/api/chatmessage-get?view=graph-rest-1.0&tabs=http

Unfortunately, I have no idea how to implement the delegated permissions in WEBCON. Does WEBCON authentication have to be implemented via Azure AD (Entra ID) so that the user's token is available? We are currently using our local AD.

Does anyone have any experience here and can help me further?

Many thanks in advance and best regards
Marc