The app has been running for 6+ months and this is the first time I have seen this.
What does this mean, and how can we prevent this?
Since your app has been running in the production environment, this type of problem should be addressed urgently by submitting a support ticket where our dedicated support engineers can help you more timely.
But be prepared for more information if you have such as a log file with other error code/details, your app type and authentication method (3-legged or password flow) etc.
These situations can be best handled by the developer support team from the back-end who can investigate the actual root cause.
You need to provide some more info regarding the API you are using, your oauth grant_type, your app_id etc
Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.
Download RingCentral Phone for Desktop:
Tip: switch to the "sandbox mode" before logging in the app:
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