Fix anchor on signup-administration.md

docs/azure-saas-docs/content/en/components/signup-administration.md

@@ -75,7 +75,7 @@ When a new tenant is created, the SignupAdmin site will make a REST call to the
 
 ### Sign In
 
-See the [Sign-In Flow](../identity/identity-flows#Sign-In) in Identity Flows.
+See the [Sign-In Flow](../identity/identity-flows#sign-in) in Identity Flows.
 
 ### Onboarding Flow