Hi there,
First, you'll need to know your organization's "Friendly URL" for SSO access to Anaplan. Then follow the steps to "Add your Friendly URL for SSO Access" at
https://community.anaplan.com/anapedia/excel-add-in/installation-setup
When you're done setting things up, just click the regular
Log In command on the ribbon to launch your organization's SSO sign-in page within Excel.
Hope that helps :D[url=https://community.anaplan.com/anapedia/excel-add-in/installation-setup]
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Daniel, Anaplan staff