diff --git a/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SaaSAuthentication.java b/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SaaSAuthentication.java
index 8fa3c495e..133a24614 100644
--- a/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SaaSAuthentication.java
+++ b/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SaaSAuthentication.java
@@ -55,7 +55,7 @@ private String retrieveToken(Product product, JwtCredential jwtCredential) {
       TokenResponse tokenResponse = jsonMapper.fromJson(EntityUtils.toString(response.getEntity()), TokenResponse.class);
       tokens.put(product, tokenResponse.getAccessToken());
     } catch (Exception e) {
-      LOG.warn("Authenticating for " + product + " failed due to " + e);
+      LOG.error("Authenticating for " + product + " failed due to " + e);
       throw new RuntimeException("Unable to authenticate", e);
     }
     return tokens.get(product);
diff --git a/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SelfManagedAuthentication.java b/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SelfManagedAuthentication.java
index 02fb10c46..8e0f4b07b 100644
--- a/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SelfManagedAuthentication.java
+++ b/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SelfManagedAuthentication.java
@@ -88,7 +88,7 @@ private String retrieveToken(Product product, JwtCredential jwtCredential) {
       TokenResponse tokenResponse =  jsonMapper.fromJson(EntityUtils.toString(response.getEntity()), TokenResponse.class);
       tokens.put(product, tokenResponse.getAccessToken());
     } catch (Exception e) {
-      LOG.warn("Authenticating for " + product + " failed due to " + e);
+      LOG.error("Authenticating for " + product + " failed due to " + e);
       throw new RuntimeException("Unable to authenticate", e);
     }
     return tokens.get(product);
diff --git a/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SimpleAuthentication.java b/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SimpleAuthentication.java
index 706adfa21..f6d9ed8e3 100644
--- a/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SimpleAuthentication.java
+++ b/camunda-sdk-java/java-common/src/main/java/io/camunda/common/auth/SimpleAuthentication.java
@@ -47,8 +47,7 @@ public Authentication build() {
   private void retrieveToken(Product product, SimpleCredential simpleCredential) {
     try {
       HttpPost httpPost = new HttpPost(authUrl);
-      httpPost.addHeader("Content-Type", "application/json");
-      List<NameValuePair> params = new ArrayList<NameValuePair>();
+      List<NameValuePair> params = new ArrayList<>();
       params.add(new BasicNameValuePair("username", simpleCredential.user));
       params.add(new BasicNameValuePair("password", simpleCredential.password));
       httpPost.setEntity(new UrlEncodedFormEntity(params));
@@ -58,14 +57,14 @@ private void retrieveToken(Product product, SimpleCredential simpleCredential) {
       String cookie = response.getHeader("Set-Cookie").getValue();
       tokens.put(product, cookie);
     } catch (Exception e) {
-      LOG.warn("Authenticating for " + product + " failed due to " + e);
-      throw new RuntimeException("Unable to authenticate");
+      LOG.error("Authenticating for " + product + " failed due to " + e);
+      throw new RuntimeException("Unable to authenticate", e);
     }
   }
 
 
     @Override
   public Map.Entry<String, String> getTokenHeader(Product product) {
-    return new AbstractMap.SimpleEntry<>("Authorization", "Cookie " + tokens.get(product));
+    return new AbstractMap.SimpleEntry<>("Cookie", tokens.get(product));
   }
 }
diff --git a/spring-boot-starter-camunda/src/main/java/io/camunda/zeebe/spring/client/configuration/OperateClientConfiguration.java b/spring-boot-starter-camunda/src/main/java/io/camunda/zeebe/spring/client/configuration/OperateClientConfiguration.java
index 79aeb804c..d4c3a30bd 100644
--- a/spring-boot-starter-camunda/src/main/java/io/camunda/zeebe/spring/client/configuration/OperateClientConfiguration.java
+++ b/spring-boot-starter-camunda/src/main/java/io/camunda/zeebe/spring/client/configuration/OperateClientConfiguration.java
@@ -31,7 +31,6 @@ public class OperateClientConfiguration {
   @Bean
   @ConditionalOnMissingBean
   public CamundaOperateClient camundaOperateClient(OperateClientConfigurationProperties props) {
-    LOG.warn("Using a deprecated operate properties");
     CamundaOperateClient client;
     try {
       client = new CamundaOperateClientBuilder()