Is there any graph api exist which fetch all members in a particular channel in ms team?
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There's no such thing as members of a channel - all members of the Team are considered members of all channels. Unless you're talking about Private channels.
To fetch members of a channel/team, use the corresponding /group/members endpoint as detailed in the documentation: https://docs.microsoft.com/en-us/graph/api/resources/teams-api-overview?view=graph-rest-1.0#membersh...