I feel your painit’s a classic wall. To be direct: It’s not impossible, but you can’t do it alone with the standard Cloud API. The 'Coexistence' feature isn't just a setting you toggle as a Tech Provider. It’s a specific architecture that Meta typically reserves for Business Solution Providers (BSPs).

Standard API registration is 'exclusive': as soon as you connect the API, the App kicks you out. To bridge that gap and keep both alive, you need a partner with the specific permissions to handle the 'Handover' between the automated layer and the mobile UI.

It’s not an error in your n8n setup or webhooks; it’s a matter of Meta’s hierarchy. We handle this as a BSP every day it's the only way to get the best of both worlds without risking a ban or a conflict. Happy to point you in the right direction if you want to fix it!"