Magento 2 started checkout trigger not syncing with Klaviyo

Hi, We’re having issues and have found that Magento 2 started checkout trigger is not syncing with Klaviyo. See below information:

• Klaviyo don't seem to be calling our API
• We replicated their API call and had no issues
• First arose around 1st April. 7th April it started syncing again. 11th April the sync stops.
• Other Magento 2 triggers seem to be syncing every hour as normal.

We’re not sure if this is a widespread issue and/or steps we can take to solve asap.

Thanks,