Hi Toby, the API appears to be working fine and we're able to connect to our Sesames via Wi-Fi. The blinking red light means the Wi-Fi module isn't able to connect to your network and doesn't reflect API status.
Unfortunately users have reported connectivity issues with SSIDs that are both 2.4GHz and 5GHz, and we believe this may be the cause of your connectivity issues. We're very sorry about the inconvenience caused and recommend linking the Wi-Fi Access Point to a 2.4GHz network if possible! - CANDY HOUSE