I am hoping someone has gone through this and had this same issue already. And solved it , of course 
I get all the way through the integration and after I add my credentials a couple times I then get directed to a Google webpage that says" Can’t link to my project" " my project" is the name of the current project I am attempting to link to.
I have a feeling that this is not so much a problem with the integration but more with how my Nest thermostat is linked/not linked to either Google/Alexa or something like that. Please let me know if you have any ideas of where I need to be checking or looking at to get these connected up. Thanks so much…