DID stands for Direct Inward Dial. Translated, that's the phone number you purchased/assigned to the profile.
Did you assign the number to a messaging profile in Telnyx? This might help: Setting Up a Messaging Profile | Telnyx Support
I figured it out, the last character of the API key was missing. Copying and pasting it several times always left out the last character?
All now seems to be working well. Thank you!
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