diff --git a/example/docker-caddy/docker-compose.yaml b/example/docker-caddy/docker-compose.yaml
index 3e468ad..e5a7edd 100644
--- a/example/docker-caddy/docker-compose.yaml
+++ b/example/docker-caddy/docker-compose.yaml
@@ -1,6 +1,6 @@
 services:
   caddy:
-    image: caddy
+    image: docker.io/caddy
     ports:
       - "80:80"
       - "443:443"
@@ -9,7 +9,7 @@ services:
       - ./caddy/data:/data
       - ./caddy/config:/config
   drasl:
-    image: unmojang/drasl
+    image: docker.io/unmojang/drasl
     volumes:
       - ./config:/etc/drasl
       - ./data:/var/lib/drasl
diff --git a/example/docker/docker-compose.yaml b/example/docker/docker-compose.yaml
index e6beb62..5f049e9 100644
--- a/example/docker/docker-compose.yaml
+++ b/example/docker/docker-compose.yaml
@@ -1,5 +1,3 @@
-version: "3"
-
 services:
   drasl:
     image: unmojang/drasl
diff --git a/front.go b/front.go
index fc6ab39..782fe31 100644
--- a/front.go
+++ b/front.go
@@ -1314,7 +1314,7 @@ func frontChallenge(app *App, action string) func(c echo.Context) error {
 				}
 
 				if provider.Config.AllowChoosingPlayerName {
-					playerName = c.FormValue("playerName")
+					playerName = c.QueryParam("playerName")
 				} else {
 					if preferredPlayerName, ok := app.getPreferredPlayerName(claims.GetUserInfo()).Get(); ok {
 						playerName = preferredPlayerName
@@ -1323,11 +1323,7 @@ func frontChallenge(app *App, action string) func(c echo.Context) error {
 					}
 				}
 			} else {
-				username := c.QueryParam("username")
-				if err := app.ValidateUsername(username); err != nil {
-					return NewWebError(returnURL, "Invalid username: %s", err)
-				}
-				playerName = username
+				playerName = c.QueryParam("playerName")
 			}
 		} else if action == ChallengeActionCreatePlayer {
 			playerName = c.QueryParam("playerName")
diff --git a/front_test.go b/front_test.go
index 3f7d62f..44ce65b 100644
--- a/front_test.go
+++ b/front_test.go
@@ -589,7 +589,7 @@ func (ts *TestSuite) testRegistrationNewPlayerInvite(t *testing.T) {
 
 func (ts *TestSuite) solveRegisterChallenge(t *testing.T, username string) *http.Cookie {
 	// Get challenge skin
-	req := httptest.NewRequest(http.MethodGet, "/web/register-challenge?username="+username, nil)
+	req := httptest.NewRequest(http.MethodGet, "/web/register-challenge?playerName="+username, nil)
 	rec := httptest.NewRecorder()
 	ts.Server.ServeHTTP(rec, req)
 	assert.Equal(t, http.StatusOK, rec.Code)
@@ -972,12 +972,12 @@ func (ts *TestSuite) testRegistrationExistingPlayerVerification(t *testing.T) {
 		ts.registrationShouldFail(t, rec, "Couldn't verify your skin, maybe try again: player does not have a skin", returnURL)
 	}
 	{
-		// Get challenge skin with invalid username should fail
-		req := httptest.NewRequest(http.MethodGet, "/web/register-challenge?username=AReallyReallyReallyLongUsername&returnUrl="+ts.App.FrontEndURL+"/web/registration", nil)
+		// Get challenge skin with invalid player name should fail
+		req := httptest.NewRequest(http.MethodGet, "/web/register-challenge?playerName=AReallyReallyReallyLongPlayerName&returnUrl="+ts.App.FrontEndURL+"/web/registration", nil)
 		rec := httptest.NewRecorder()
 		ts.Server.ServeHTTP(rec, req)
 		assert.Equal(t, http.StatusSeeOther, rec.Code)
-		assert.Equal(t, "Invalid username: neither a valid player name (can't be longer than 16 characters) nor an email address", getErrorMessage(rec))
+		assert.Equal(t, "Invalid player name: can't be longer than 16 characters", getErrorMessage(rec))
 		assert.Equal(t, returnURL, rec.Header().Get("Location"))
 	}
 	{
diff --git a/main.go b/main.go
index 41e9540..d1cb3c9 100644
--- a/main.go
+++ b/main.go
@@ -496,6 +496,7 @@ func setup(config *Config) *App {
 				playerCertificateKeys = append(playerCertificateKeys, *publicKey)
 			}
 		}
+		log.Printf("Fetched public keys from fallback API server %s", fallbackAPIServer.Nickname)
 	}
 
 	// OIDC providers