Each Nexmo account will enable you to add up to 2 US pre-approved short codes: 1 for 2FA and 1 for Alerts.
For 2FA, you can have 1 template.
For Alerts you can have a maximum of 6 templates. If you require more than this, you can apply for a blank template for review/approval. Contact firstname.lastname@example.org if you need to create more than one template.
If you require further assistance creating campaigns, contact email@example.com.