Error message in SharePoint web part

Your adenin web part is showing an error message like

InteractionRequiredAuthError: AADSTS65001: The user or administrator has not consented to use the application ...

or

Error: Token request previously failed

Edit the web part to see a detailed error message along with the Grant API Access button.

Clicking this will direct you to the API Access page where you can approve any permissions listed under Pending requests.