Improve error logging (google home + instance get access token)

[Pierre-Gilles]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.26%. Comparing base (bccc591) to head (6b19c2f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
core/api/instance/instance.model.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #168   +/-   ##
=======================================
  Coverage   87.26%   87.26%           
=======================================
  Files          71       71           
  Lines        2403     2403           
=======================================
  Hits         2097     2097           
  Misses        306      306           

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