AWS End User Messaging for 2 countries do I need two setups for different regions

When setting up AWS End User Messaging for OTP (One-Time Password) in two countries in different regions, such as the UK in Europe and New Zealand in Oceania, you don't necessarily need to create two separate setups in different AWS regions. However, there are some important considerations to keep in mind:

1. Regional Availability: AWS End User Messaging SMS is available in several AWS Regions. You can use a single region to send messages to multiple countries, as long as that region supports sending to your target countries.

2. Phone Numbers: The phone numbers you use for SMS messages (including short codes, long codes, toll-free numbers, and 10DLC numbers) cannot be replicated across AWS Regions. This means if you want to use local numbers for each country, you would need to request separate phone numbers in each region where you plan to use AWS End User Messaging SMS.

3. Redundancy: For mission-critical messaging programs, AWS recommends configuring AWS End User Messaging SMS in more than one AWS Region. This provides additional redundancy and can help improve resiliency.

4. Sender IDs: If you're using sender IDs instead of phone numbers, you may be able to use the same sender ID across multiple countries, depending on the regulations in those countries.

5. Configuration Sets: You can create a single configuration set that includes rules for both countries. This can be associated with your account as the default, allowing you to manage your SMS settings for both countries from one place.

6. Protect Configurations: You can create a protect configuration that includes rules for both countries, setting it as your account default. This will control which destination countries your messages can be sent to.

Given these factors, here's a suggested approach:

1. If your use case isn't mission-critical, you could potentially set up AWS End User Messaging in a single region that supports both the UK and New Zealand.

2. Create a configuration set that includes settings for both countries.

3. Set up a protect configuration that allows sending to both the UK and New Zealand.

4. If you need local numbers, you'll need to request separate phone numbers for each country.

5. If you're using sender IDs, check if you can use the same ID for both countries or if you need separate ones.

6. If redundancy is crucial, consider setting up in two regions (e.g., Europe (London) and Asia Pacific (Sydney)) for added resilience.

Remember to review the specific requirements and regulations for SMS messaging in both the UK and New Zealand to ensure compliance with local laws and best practices.
Sources
AWS End User Messaging SMS Best Practices - AWS End User Messaging SMS
Using protect configurations in AWS End User Messaging SMS - AWS End User Messaging SMS
How to Send SMS Using a Sender ID with AWS End User Messaging | AWS Messaging & Targeting Blog
AWS End User Messaging SMS concepts - AWS End User Messaging SMS