diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index d2ecb11..5fc51d0 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -1,5 +1,15 @@
 parameters:
 	ignoreErrors:
+		-
+			message: "#^Method InnoGE\\\\LaravelMsGraphMail\\\\MicrosoftGraphTransport\\:\\:transformEmailAddress\\(\\) return type has no value type specified in iterable type array\\.$#"
+			count: 1
+			path: src/MicrosoftGraphTransport.php
+
+		-
+			message: "#^Method InnoGE\\\\LaravelMsGraphMail\\\\MicrosoftGraphTransport\\:\\:transformEmailAddresses\\(\\) should return array\\<array\\<string, array\\<string, string\\>\\>\\> but returns array\\.$#"
+			count: 1
+			path: src/MicrosoftGraphTransport.php
+
 		-
 			message: "#^Parameter \\#1 \\$message of static method Symfony\\\\Component\\\\Mime\\\\MessageConverter\\:\\:toEmail\\(\\) expects Symfony\\\\Component\\\\Mime\\\\Message, Symfony\\\\Component\\\\Mime\\\\RawMessage given\\.$#"
 			count: 1
@@ -9,3 +19,13 @@ parameters:
 			message: "#^Parameter \\#2 \\$html of method InnoGE\\\\LaravelMsGraphMail\\\\MicrosoftGraphTransport\\:\\:prepareAttachments\\(\\) expects string\\|null, resource\\|string\\|null given\\.$#"
 			count: 1
 			path: src/MicrosoftGraphTransport.php
+
+		-
+			message: "#^Method InnoGE\\\\LaravelMsGraphMail\\\\Services\\\\MicrosoftGraphApiService\\:\\:getAccessToken\\(\\) should return string but returns mixed\\.$#"
+			count: 1
+			path: src/Services/MicrosoftGraphApiService.php
+
+		-
+			message: "#^Method InnoGE\\\\LaravelMsGraphMail\\\\Services\\\\MicrosoftGraphApiService\\:\\:sendMail\\(\\) has parameter \\$payload with no value type specified in iterable type array\\.$#"
+			count: 1
+			path: src/Services/MicrosoftGraphApiService.php
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 9aa5399..40e24a1 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -8,5 +8,3 @@ parameters:
     tmpDir: build/phpstan
     checkOctaneCompatibility: true
     checkModelProperties: true
-    checkMissingIterableValueType: false
-    checkGenericClassInNonGenericObjectType: false
diff --git a/src/MicrosoftGraphTransport.php b/src/MicrosoftGraphTransport.php
index 9264699..517100c 100644
--- a/src/MicrosoftGraphTransport.php
+++ b/src/MicrosoftGraphTransport.php
@@ -61,6 +61,9 @@ protected function doSend(SentMessage $message): void
         $this->microsoftGraphApiService->sendMail($envelope->getSender()->getAddress(), $payload);
     }
 
+    /**
+     * @return array<int, array<int<0, max>, array<string, bool|string|null>>|string|null>
+     */
     protected function prepareAttachments(Email $email, ?string $html): array
     {
         $attachments = [];
@@ -83,6 +86,7 @@ protected function prepareAttachments(Email $email, ?string $html): array
 
     /**
      * @param  Collection<array-key, Address>  $recipients
+     * @return array<array-key, array<string, array<string, string>>>
      */
     protected function transformEmailAddresses(Collection $recipients): array
     {
diff --git a/src/Services/MicrosoftGraphApiService.php b/src/Services/MicrosoftGraphApiService.php
index 462144a..c11cf49 100644
--- a/src/Services/MicrosoftGraphApiService.php
+++ b/src/Services/MicrosoftGraphApiService.php
@@ -3,7 +3,6 @@
 namespace InnoGE\LaravelMsGraphMail\Services;
 
 use Illuminate\Http\Client\PendingRequest;
-use Illuminate\Http\Client\RequestException;
 use Illuminate\Http\Client\Response;
 use Illuminate\Support\Facades\Cache;
 use Illuminate\Support\Facades\Http;
@@ -18,9 +17,6 @@ public function __construct(
         protected readonly int $accessTokenTtl
     ) {}
 
-    /**
-     * @throws RequestException
-     */
     public function sendMail(string $from, array $payload): Response
     {
         return $this->getBaseRequest()
@@ -49,10 +45,7 @@ protected function getAccessToken(): string
             $response->throw();
 
             $accessToken = $response->json('access_token');
-            if (! is_string($accessToken)) {
-                $notString = var_export($accessToken, true);
-                throw new InvalidResponse("Expected response to contain key access_token of type string, got: {$notString}.");
-            }
+            throw_unless(is_string($accessToken), new InvalidResponse('Expected response to contain key access_token of type string, got: {'.var_export($accessToken, true).' }.'));
 
             return $accessToken;
         });