diff --git a/localstack/services/s3/utils.py b/localstack/services/s3/utils.py
index fb196fcbfab57..6705e7c0fc618 100644
--- a/localstack/services/s3/utils.py
+++ b/localstack/services/s3/utils.py
@@ -593,7 +593,7 @@ def capitalize_header_name_from_snake_case(header_name: str) -> str:
     return "-".join([part.capitalize() for part in header_name.split("-")])
 
 
-def get_kms_key_arn(kms_key: str, account_id: str, bucket_region: str = None) -> Optional[str]:
+def get_kms_key_arn(kms_key: str, account_id: str, bucket_region: str) -> Optional[str]:
     """
     In S3, the KMS key can be passed as a KeyId or a KeyArn. This method allows to always get the KeyArn from either.
     It can also validate if the key is in the same region, and raise an exception.
diff --git a/localstack/services/s3/v3/provider.py b/localstack/services/s3/v3/provider.py
index 12597439fb015..8219bd6b2de22 100644
--- a/localstack/services/s3/v3/provider.py
+++ b/localstack/services/s3/v3/provider.py
@@ -3601,7 +3601,9 @@ def get_encryption_parameters_from_request_and_bucket(
             key_id = kms_key_id or s3_bucket.encryption_rule[
                 "ApplyServerSideEncryptionByDefault"
             ].get("KMSMasterKeyID")
-            kms_key_id = get_kms_key_arn(key_id, s3_bucket.bucket_account_id)
+            kms_key_id = get_kms_key_arn(
+                key_id, s3_bucket.bucket_account_id, s3_bucket.bucket_region
+            )
             if not kms_key_id:
                 # if not key is provided, AWS will use an AWS managed KMS key
                 # create it if it doesn't already exist, and save it in the store per region
diff --git a/localstack/utils/aws/arns.py b/localstack/utils/aws/arns.py
index 7f03193285c53..6ba01e91aee07 100644
--- a/localstack/utils/aws/arns.py
+++ b/localstack/utils/aws/arns.py
@@ -5,9 +5,8 @@
 
 from botocore.utils import ArnParser, InvalidArnException
 
-from localstack.aws.accounts import DEFAULT_AWS_ACCOUNT_ID, get_aws_account_id
+from localstack.aws.accounts import DEFAULT_AWS_ACCOUNT_ID
 from localstack.aws.connect import connect_to
-from localstack.utils.aws.aws_stack import get_region
 
 LOG = logging.getLogger(__name__)
 
@@ -72,12 +71,9 @@ def extract_resource_from_arn(arn: str) -> Optional[str]:
 #
 
 
-# TODO make account_id and region required
-def _resource_arn(name: str, pattern: str, account_id: str = None, region_name: str = None) -> str:
+def _resource_arn(name: str, pattern: str, account_id: str, region_name: str) -> str:
     if ":" in name:
         return name
-    account_id = account_id or get_aws_account_id()
-    region_name = region_name or get_region()
     if len(pattern.split("%s")) == 3:
         return pattern % (account_id, name)
     return pattern % (region_name, account_id, name)
@@ -280,8 +276,6 @@ def sqs_queue_arn(queue_name: str, account_id: str, region_name: str) -> str:
 
 
 def apigateway_restapi_arn(api_id: str, account_id: str, region_name: str) -> str:
-    account_id = account_id or get_aws_account_id()
-    region_name = region_name or get_region()
     return "arn:aws:apigateway:%s:%s:/restapis/%s" % (region_name, account_id, api_id)
 
 
@@ -299,7 +293,7 @@ def opensearch_domain_name(domain_arn: str) -> str:
 
 def apigateway_invocations_arn(lambda_uri: str, region_name: str) -> str:
     return "arn:aws:apigateway:%s:lambda:path/2015-03-31/functions/%s/invocations" % (
-        region_name or get_region(),
+        region_name,
         lambda_uri,
     )
 
diff --git a/tests/aws/services/lambda_/test_lambda_legacy.py b/tests/aws/services/lambda_/test_lambda_legacy.py
deleted file mode 100644
index e69de29bb2d1d..0000000000000
diff --git a/tests/aws/services/s3/test_s3.py b/tests/aws/services/s3/test_s3.py
index 9e85e77320bb9..aec9caed543ba 100644
--- a/tests/aws/services/s3/test_s3.py
+++ b/tests/aws/services/s3/test_s3.py
@@ -9912,7 +9912,7 @@ def test_s3_presigned_post_success_action_status_201_response(self, s3_bucket, a
         assert "PostResponse" in json_response
         json_response = json_response["PostResponse"]
 
-        location = f"{_bucket_url_vhost(s3_bucket, aws_stack.get_region())}/key-my-file"
+        location = f"{_bucket_url_vhost(s3_bucket, TEST_AWS_REGION_NAME)}/key-my-file"
         etag = '"43281e21fce675ac3bcb3524b38ca4ed"'
         assert response.headers["ETag"] == etag
         assert response.headers["Location"] == location