Stripe Mode Health Check
What is the issue?
Your Stripe account was connected with the "Test Mode Only" option checked.
Why is this a problem?
In this mode you can not process live charges. You can not accept payment through the event website or checkout pages.
What do I need to do?
You will need to disconnect the Stripe account and reconnect it without checking the 'test mode only' checkbox on the connection page.
See How To Change Stripe Test Mode Only for more information.