Thank you for choosing Microsoft Power Platform Communities.
Automating a welcome message for new joiners in chats (rather than channels) is a bit tricky, as the out-of-the-box Power Automate triggers are designed for channels.
However, there are some potential workarounds:
Custom Power Automate Flow: You could use the Microsoft Graph API in combination with Power Automate to monitor chat membership changes. When a new member is added to a chat, you can trigger a flow to send a welcome message. This requires some technical setup and permissions to access the Graph API.
Bot Integration: Consider creating a bot using Microsoft Bot Framework or Power Virtual Agents. The bot can monitor chat activity and send automated messages when a new member joins. This approach might require development resources.
Manual Trigger: If automation isn't feasible, you could create a template message that can be manually sent by a team member whenever someone joins a chat.
If this fixes the issue, please mark as resolved to help others with find it.
Happy to help,
Robu1 | Superuser & Moderator