FOUR-31151 Fix issue when oauth client id is the same as the user id

database/seeders/UserSeeder.php

@@ -55,7 +55,9 @@ public function run(ClientRepository $clients)
         ]);
 
         // Create client so we can generate tokens
-        $clients->createPersonalAccessGrantClient('PmApi');
+        $personalAccessClient = $clients->createPersonalAccessGrantClient('PmApi');
+        $personalAccessClient->user_id = $user->id;
+        $personalAccessClient->save();
 
         // Create client OAuth (for 3-legged auth) - Authorization Code Grant for Swagger UI
         $clients->createAuthorizationCodeGrantClient(

upgrades/2026_05_07_212653_set_user_id_on_oauth_client.php

@@ -0,0 +1,60 @@
+<?php
+
+use Illuminate\Support\Facades\DB;
+use ProcessMaker\Upgrades\UpgradeMigration as Upgrade;
+
+class SetUserIdOnOauthClient extends Upgrade
+{
+    /**
+     * Run any validations/pre-run checks to ensure the environment, settings,
+     * packages installed, etc. are right correct to run this upgrade.
+     *
+     * Throw a \RuntimeException if the conditions are *NOT* correct for this
+     * upgrade migration to run. If this is not a required upgrade, then it
+     * will be skipped. Otherwise the exception thrown will be caught, noted,
+     * and will prevent the remaining migrations from continuing to run.
+     *
+     * Returning void or null denotes the checks were successful.
+     *
+     * @return void
+     *
+     * @throws RuntimeException
+     */
+    public function preflightChecks()
+    {
+        //
+    }
+
+    /**
+     * Run the upgrade migration.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        $adminUserId = DB::table('users')
+            ->where('is_administrator', true)
+            ->orderBy('id')
+            ->value('id');
+
+        if ($adminUserId === null) {
+            return;
+        }
+
+        DB::table('oauth_clients')
+            ->where('name', 'PmApi')
+            ->update(['user_id' => $adminUserId]);
+    }
+
+    /**
+     * Reverse the upgrade migration.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        DB::table('oauth_clients')
+            ->where('name', 'PmApi')
+            ->update(['user_id' => null]);
+    }
+}