Did you realize your Custom Flow is set as subscription when it should be promotional or vice versa? Here's how you can switch it:
Go to your Custom Flows section under Flows in the side menu. Select the Flow you'd like to change the type of:
Select the three dots located to the left of 'Save And Exit'. Open Flow Settings:
Select the type of flow you'd like to change it to:
For more information on when to select a subscription versus promotional flow see our article on Custom Flows here.
Important note: On July 31, 2019 Facebook is going to switch from app-level permission for subscription broadcasts and subscription flows to page specific permission. See more information on how to request permission by clicking here.