@RKumar If your flow is running on an automated trigger then it will always run in the context of an owner of flow (Who created the flow).
You can still try "Manage Run-Only Users" but that only appears on manual triggers, such as Flow Button, SharePoint “For a selected item” and “For a selected file”.
For details see- https://flow.microsoft.com/en-us/blog/advanced-button-sharing/
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