I can not get approved for OTP services. Please Help?!?

It seems you may be encountering some confusion in the process of setting up OTP (One-Time Password) services with AWS. For OTP functionality, you typically don't need to go through the full US_TEN_DLC_CAMPAIGN_REGISTRATION process, which is more suited for broader SMS marketing campaigns.

For OTP services, you should be looking at AWS End User Messaging SMS, specifically within the SMS sandbox environment to start. Here's a simplified process you should follow:

1. Set up an AWS End User Messaging account.
2. Create a phone pool and a default configuration set.
3. Register your brand (this usually takes less than a day).
4. Register a campaign (also typically takes less than a day).
5. Request an originating ID using your registered brand and campaign (this may take a few days).
6. Once you have the originating ID, you can send a test message to verify a new number.
7. This will deliver a verification code to the phone being validated.
8. After clearing this challenge, you'll be able to use the originating ID to send test messages to verified numbers.

It's important to note that while in the sandbox environment, you can only send SMS messages to phone numbers that have been verified through this process. This is a security measure implemented by AWS.

If you're still facing issues after following these steps, it may be worth contacting AWS Support for more specific guidance based on your account and use case. They can provide detailed instructions and help resolve any remaining obstacles in your OTP setup process.

Remember, the goal here is to set up a system for sending one-time passwords, not to create a marketing campaign, so the requirements and process are different from what you've been working on.

Sources
facing challenges getting a US phone number verified for AWS End User Messaging in sandbox | AWS re:Post
Adding and verifying phone numbers in the Amazon SNS SMS sandbox - Amazon Simple Notification Service