There's an important note in the first few paragraphs of the Visa Direct documentation, that discuss the requirements to use Visa Direct and it's shaded in yellow.
After you've read the documentation and if you meet the requirements shaded in yellow, then please fill out the Visa Direct Program Implementation Questionnaire, and submit to the email address listed on that form.
Feel free to reply to my post or submit a new post to the community forum and someone can work with you to resolve the issue.
Visa Developer Team
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