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Are they both 1st Gen ? The 1st Gen is api compatible. If they are both
the same maybe trying to switch them. While creating the new project and
see if it gives the same error/issue? Isolate that the device itself is
not the issue. Or maybe trying a ...
I apologize I thought this was a thermostat issue. I see your attempting
to create a new Project, generating an Oauth2 cred linking device the
above steps provided by "sipriyadarshi" seem correct. However the link
is not good on my end as well.