teams.addChatMember adds and returns a chat member.
Example
automations/teams-add-chat-member.automation.ts
Inputs
Pass the opaquechatId and Microsoft Entra userId. roles defaults to an empty array for a regular member; use ["owner"] for an owner. Optional visibleHistoryStartAt controls the earliest chat history visible to the new member. The optional second argument { account } selects a Microsoft binding.