diff --git a/src/backend/Firebase.res b/src/backend/Firebase.res
index c5e9cf9..70de170 100644
--- a/src/backend/Firebase.res
+++ b/src/backend/Firebase.res
@@ -503,11 +503,15 @@ module StyledFirebaseAuth = {
 module Functions = {
   type t
 
+  // we are currently using just these two, but more can be added if needed
+  // @see https://firebase.google.com/docs/functions/locations
+  type functionLocation = [#"europe-central2" | #"europe-west3"]
+
   @module("firebase/functions")
   external getFunctions: FirebaseApp.t => t = "getFunctions"
 
   @module("firebase/functions")
-  external getFunctionsInRegion: (FirebaseApp.t, string) => t = "getFunctions"
+  external getFunctionsInRegion: (FirebaseApp.t, functionLocation) => t = "getFunctions"
 
   type callResult<'a> = {data: 'a}
   @module("firebase/functions")
diff --git a/src/backend/FirebaseWebAuthn.res b/src/backend/FirebaseWebAuthn.res
index c119dcf..11c18fa 100644
--- a/src/backend/FirebaseWebAuthn.res
+++ b/src/backend/FirebaseWebAuthn.res
@@ -1,16 +1,17 @@
 @module("@firebase-web-authn/browser")
-external linkWithPasskey: (
+external createUserWithPasskey: (
   Firebase.Auth.t,
   Firebase.Functions.t,
   string,
-) => promise<Firebase.Auth.userCredential> = "linkWithPasskey"
+) => promise<Firebase.Auth.userCredential> = "createUserWithPasskey"
 
 @module("@firebase-web-authn/browser")
-external createUserWithPasskey: (
+external linkWithPasskey: (
   Firebase.Auth.t,
   Firebase.Functions.t,
   string,
-) => promise<Firebase.Auth.userCredential> = "createUserWithPasskey"
+) => promise<Firebase.Auth.userCredential> = "linkWithPasskey"
+
 
 @module("@firebase-web-authn/browser")
 external signInWithPasskey: (
diff --git a/src/components/FirebaseAuthProvider/FirebaseAuthProvider.res b/src/components/FirebaseAuthProvider/FirebaseAuthProvider.res
index 3e3115d..40b6eec 100644
--- a/src/components/FirebaseAuthProvider/FirebaseAuthProvider.res
+++ b/src/components/FirebaseAuthProvider/FirebaseAuthProvider.res
@@ -14,7 +14,7 @@ let make = (~children) => {
   Auth.setLanguageCode(auth, "cs")
 
   let analytics = app->Analytics.getAnalytics
-  let functions = app->Functions.getFunctionsInRegion(`europe-west3`)
+  let functions = app->Functions.getFunctionsInRegion(#"europe-west3")
   let messaging = app->Messaging.getMessaging
 
   <AppCheckProvider sdk=appCheck>
diff --git a/src/pages/Onboarding/Onboarding.res b/src/pages/Onboarding/Onboarding.res
index b3938f5..386bae0 100644
--- a/src/pages/Onboarding/Onboarding.res
+++ b/src/pages/Onboarding/Onboarding.res
@@ -22,7 +22,7 @@ let make = (~children, ~user: Firebase.User.t) => {
     let email = user.email->Null.getExn
     try {
       // TODO: upgrade the FirebaseWebAuthn and deploy to "europe-west3"
-      let functions = app->Firebase.Functions.getFunctionsInRegion(`us-central1`)
+      let functions = app->Firebase.Functions.getFunctionsInRegion(#"europe-central2")
       let _ = await FirebaseWebAuthn.linkWithPasskey(auth, functions, email)
       setWebAuthn(Some("1"))
     } catch {
diff --git a/src/pages/Unauthenticated/Unauthenticated.res b/src/pages/Unauthenticated/Unauthenticated.res
index 78e0904..605a3eb 100644
--- a/src/pages/Unauthenticated/Unauthenticated.res
+++ b/src/pages/Unauthenticated/Unauthenticated.res
@@ -8,7 +8,7 @@ let make = () => {
   let (view, setView) = React.useState(() => SignIn)
   let (signInWithPasskey, runSignInWithPasskey) = Hooks.usePromise(() => {
     // TODO: upgrade the FirebaseWebAuthn and deploy to "europe-west3"
-    let functions = app->Firebase.Functions.getFunctionsInRegion(`us-central1`)
+    let functions = app->Firebase.Functions.getFunctionsInRegion(#"europe-central2")
     FirebaseWebAuthn.signInWithPasskey(auth, functions)
   })
   let isOnlineStatus = DomUtils.useIsOnline()