Error in V3 API
There is a bug in the new V3 OAuth2 API. The server is not accepting URL encoded strings. In particular, the scopes must be separated by a plus sign (+). As an properly encode URL, they should be %2B, but that does not work. You have to pass them as an actual plus (+) sign.
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This used to work correctly in the previous version of the OAuth2 API, but appears to have been broken with the new PKCE end points. I have a workaround (use + instead of %2B), but I think this should be fixed.
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More details here: https://community.constantcontact.com/t5/Developer-Support-ask-questions/One-or-more-scopes-are-not-configured-for-the-authorization/td-p/382979
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Thanks!
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