Shopify - {Id}.ngrok-free.app refused to connect error

[arjunguptha]

Creating shopify app just for the first time.

I followed the steps from below

https://shopify.dev/docs/apps/getting-started/create#step-3-install-your-app-on-your-development-store

Works great up section 3 but after step 2 under section 3, I just keep receiving below error

I did connect to ngrok locally

I was able to run below command successfully as well

PS C:\shopify\testappname> shopify app dev --tunnel-url https://XXXX-XXXX-XXXX-XXXX-XXXX-810e-ea3e-6b08-d392.ngrok-free.app:8080

After pressing p and when I install the app selecting development store, I am seeing the error in 1st screenshot saying

XXXX-XXXX-XXXX-XXXX-810e-ea3e-6b08-d392.ngrok-free.app refused to connect

Any directions to fix above error would be helpful.