Received this from IFTTT today as well:
On August 31, 2019, Nest will be retiring its Works with Nest program. In turn, Nest services on IFTTT will no longer work due to this change.
The services impacted are:
Nest Thermostat
Nest Protect
Nest Cam
Your Nest Applets will remain active until the end of August, when they will then be turned off and removed. We will send another reminder before Nest Applets are turned off permanently.
For more information, please see the Nest FAQ.
At IFTTT, we believe every thing works better together. We look forward to working with Google and others to help consumers benefit from and control their data.
Thank you for your understanding.
The IFTTT Team