Twilio free trial projects impose some restrictions on Authy and Verify v1 applications for developers. For the full list, see Twilio Free Trial Limitations.
Users wishing to remove these limitations will need to upgrade to a paid Twilio project. Please note that upgrading a project removes any remaining free trial funds. The beginning balance on an upgraded project will be limited to the amount funded while upgrading, or the amount of a promo code used to upgrade.