Google Fit authorization bugs (with 5005, 5000, and 5015 errors) on WatchFace, WatchConfig, and companion app

Question

I am looking for some fresh ideas on the dreaded 5005 error: \"Status code denotes that an unknown error occurred while trying to obtain an OAuth token.\" when my Watch Face

Answer 1

I finally got an answer from Google on how useDefaultAccount works behind the scenes and this affects which Fit account is being written/read above. Here's the question I posed:

I really need an answer on the following question which has been messing my testing up for months. I am using the Fitness Apis from my Wear watch face. I use "useDefaultAccount" in the Google client builder. But which account is the default in this case? - the account used to download the app (in which case what account is used when you install the app from your dev machine) - it's null/unset - it's the account you pick your companion app when you connect. - it's the current account selected in Google Fit - you can't use useDefaultAccount in Wear faces/apps

And the answer from Google (thanks Gustavo Moura): Here's how I understand the logic (it's not very well documented and we intend to clean it up in the near future): 1. if there's a companion app and the user has signed into Fit and picked an account there, we'll sync that account to the Wear device and use it. 2. if there's no companion app (or the user hasn't signed into it), but the user has Google Fit installed and enabled, and has selected an account with Fit, we'll sync that account to the Wear device and use it. 3. if there's no companion app and no Google Fit, but the Wear device has another built-in app that has similar behavior (like Moto Body on Motorola watches), we'll use the account from that app. 4. if none of the above is true, there are still some APIs that will work even without an account (like step counter recording and querying). This is special in that any data accessed in this mode will be data local to the watch only and it will never be synced to any other devices or servers.