Call router in connect app module in Forge using Jwt

I am currently adopting Forge from connect. To call the router in the Connect app module, we were previously using JWT. But when adopting to Forge, when calling these routers, the error message appears
Could not find stored client data for ***. Is this client registered?

My current approach is that the old Connect app is running on ngrok and not installed on the site, combined with the installed Forge app.

So is there any way to call the routers of the Connect app?

Thanks