In Microsoft Power BI
Select the report
In the File menu, select Embed report, then Website or portal
Copy the URL (the top one) from the "Securely embed this report in a website or portal" popup:
Once the URL has been copied, move to Confluence
In Confluence
Embed using the dashboard URL
Copy the embed URL from Microsoft Power BI
Paste the URL into the Confluence editor
If needed, change the width and height of the macroPublish the Confluence page
Embed using the macro editor
Edit the Confluence page
Type /powerbi and hit enter
Add the embed URL and if needed, change the width and height of the macro
Publish the Confluence page