Can't receive OTP SMS in Saudi Arabia

I have set up the SMS service to send OTP for users to verify their phone numbers while signing up for my website which is Saudi Arabia based, the problem is I can't receive SMS in Saudi Arabia but other countries work fine, here is the service description I am using

Service: SNS Text Messaging Region: No region specified Resource Type: Dedicated SMS Short Codes Limit name: Transactional SMS format : Your OTP for "Name" is 1234