This takes you through updating your Power BI token.
These renew periodically and are a security feature.
When this expires, it will prevent your Power BI template from refreshing.
To renew your Power BI token:
- Click into the Insights tab, from the top menu.
 - Click on ‘3. Connect your dataset’.
 - Copy the token to your clipboard.
 - In Power BI, click on ‘Transform Data’.
 - Click ‘Edit Parameters’.
 - Paste in the token.
 - Click ‘OK’.
 - Click ‘Refresh’
 
(The full article has visual step-by-steps for this)