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?