How to register a 10DLC brand as an individual?

I apologize, but based on the information provided in the sources, it appears that the 10DLC (10-Digit Long Code) registration process is primarily designed for companies and brands, not for individuals. The registration process requires information such as a legal company name, tax ID or business registration number, and legal form of organization, which individuals typically do not have.

The 10DLC registration process is managed by an industry organization called the Campaign Registry, and it's intended for businesses and organizations that need to send bulk SMS messages. The process is not designed for personal use cases like sending alert messages to yourself.

Unfortunately, there isn't a specific pathway mentioned for individuals to register for 10DLC. The system is set up with the assumption that the registrant is a business entity. Using a Social Security Number (SSN) in place of a Tax ID is not a valid substitution in this context, which is why it was rejected.

If you only need to send alert messages to yourself, you might want to explore alternative solutions that don't require 10DLC registration. These could include using personal messaging apps, email-to-SMS gateways, or other notification services that are more suitable for individual use. If you still believe you need to use AWS SMS services for your personal alerts, you may want to contact AWS support directly to inquire about options for individual users, as the current registration process doesn't seem to accommodate this use case.
Sources
10DLC brand registration form - AWS End User Messaging SMS
10DLC registration process - AWS End User Messaging SMS