Clicking the + allows you to add a new report. After pasting the report URL, you must remember to append the “rls:embed=true" at the end of the URL.
You should be a Power BI user publishing the report and have a Power BI Pro license.
If you are a user viewing the embedded report, you need either a Power BI Pro license or the content needs to be in a workspace that’s in a Power BI Premium capacity (EM or P SKU). Power BI Report Embed Link.
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