Authorization
When you add an Excel Online card to a flow for the first time, you'll be prompted to create a new connection.

You must enable Microsoft Graph to use Excel Online. See Excel Online API documentation.

You can create multiple connections and manage them from your Connections page.
To create a new connection from an Event or Action card:
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Click New Connection.
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Add an Connection Nickname. This should be unique, so that if your teammates authorize multiple accounts, then you will be able to tell them apart.
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Click Create to launch a pop-up window to sign into your account and save this configuration.