How to get the right metadata url while configure custom IDP in AD B2C

I'm working on B2C app, where signup and signin works fine in Azure AD B2C.

In my default tenant, I have registered an app (which will work as external identity) for my B2C signin and signup page. In my default tenant, I have registered app having (APP ID: 1f8f1983-e995-471e-8ce7-b5bd04332807) and the URL (/redirect URI) is the b2c "signupandsignin" url.

That is, app registered in the default directory has APP ID: 1f8f1983-e995-471e-8ce7-b5bd04332807 and redirect URI is here, its signupandsignin URL

In my b2c tenant end, I'm configuring custom IDP (as OpenId connect) and providing reference of metadata URL.

I think the metadata URL here is correct. But not very sure.

However, I'm getting another error:

You mention client id = 1f8f1983-e995-471e-8ce7-b5bd04332807

but the redirect URI is:

https: //jr1b2c.b2clogin.com/JR1B2C.onmicrosoft.com/oauth2/v2.0/authorize?p=B2C_1_signupandsignin&client_id=4be93275-79a0-4206-aad2-7b3509687da7

That is not the redirect URL which is actually jwt.ms. That is the auth endpoint.

But the client id is different?