"An SSL error has occurred and a secure connection to the server cannot be made"

[Gökdeniz Gülmez]

Hey, I'm new on this. So I have made an API with FastAPI and am using ngrok to make it public. When deleting the config file and starting a service via basic command prompt ngrok http 8000, the API call works perfectly as intended, but on using the config file and calling the API from outside the network, I get the error messageAn SSL error has occurred and a secure connection to the server cannot be made (I am making an API call from my iPhone via the shortcuts app). The config file is:```
authtoken:
tunnels:
josie:
proto: http
addr: 8000
domain: cheetah-careful-grizzly.ngrok-free.app
version: "2"
region: us

Is that something that I have to set on my router for the port forwarding? 
Or what the hell is going on?