You can monitor the usage of different aspects of the Dynamics 365 for Marketing application under the Quota Limits section. Specifically, you can track the number of inbox previews used and remaining for the month because this impacts subscription costs directly. Similarly, tracking the total number of emails sent and remaining for the month is crucial as it also affects subscription limits and potential costs. Lastly, monitoring the total number of marketing contacts in your database and the remaining number allowed within your subscription is necessary to ensure you do not exceed your subscription constraints, as this can drive additional costs. These metrics are all critical components that directly influence subscription costs.

If no one has received any scores from the lead scoring model, adding an action tile will not resolve the issue. The model must be activated or 'go live' to start scoring leads effectively. Without making the model live, no scores will be assigned regardless of any additional actions taken.

Clicking the Go Live button is a necessary step to activate the lead scoring model. Before this action, the model will not calculate or assign any scores, which explains why no one has received any scores. Therefore, clicking the Go Live button should resolve the issue.

Lowering the Sales Ready Score would not resolve the issue of no one receiving any scores from the model. The problem likely lies in the configuration or operation of the lead scoring model itself rather than the threshold score. It could be due to data inputs not being processed correctly or the scoring rules not being applied properly. Therefore, simply adjusting the Sales Ready Score won't address the underlying issue with the scores not being generated or assigned.