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[eric-urban]

@jakeclutter - For your scenario, is the goal to secure your Web API with custom scopes as described here and here? If so, my understanding is that is beyond the scope of authenticating a Bing Ads user i.e., asking a Bing Ads user to consent to letting your app access their accounts (or granting the app access to your own accounts). For Bing Ads authentication where the OAuth scope is bingads.manage, you should register a web or native app depending in part on whether a client secret is needed. Please see Authentication with OAuth for more details. For help with a specific error please feel free to share the repro steps in the forum or via support. I hope this helps!