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Rick, this looks like you are doing everything correctly from my perspective.
Assuming that your app is bundled into the same add-on as the OAuth creds you are using?
You might want to check out this video,
This example does exactly what you are trying to do, and the source code is here:
Unfortunately, since it sounds like you are doing everything correctly ... the devil is going to be in the details.
Happy to keep working with you, but perhaps either of these resources will help in the short-term.