diff --git a/lib/Service/ContractApprovalService.php b/lib/Service/ContractApprovalService.php
index f8388c27..87d8ac76 100644
--- a/lib/Service/ContractApprovalService.php
+++ b/lib/Service/ContractApprovalService.php
@@ -57,10 +57,24 @@
  */
 class ContractApprovalService {
 	/**
-	 * The fully-qualified decidesk request-event class — the in-process
-	 * existence guard (decidesk installed + autoloaded) for delegation.
+	 * The fully-qualified request-event class spellings, NEWEST FIRST — the
+	 * in-process existence guard (the decision app installed + autoloaded) for
+	 * delegation.
+	 *
+	 * TWO SPELLINGS because a cross-app event class name is a RUNTIME lookup
+	 * this app can only follow, never move. The decision app renamed from
+	 * OCA\Decidesk to OCA\Decidiq with no compatibility alias, and this constant
+	 * named only the old one — so `isDelegationConfigured()` returned false on an
+	 * instance where the app was installed, and contract approvals silently
+	 * stopped delegating. Measured: OCA\Decidiq\Event\DecisionRequestedEvent
+	 * EXISTS, OCA\Decidesk\Event\DecisionRequestedEvent MISSING.
+	 *
+	 * @var array<int, string>
 	 */
-	public const DECISION_REQUESTED_EVENT = '\\OCA\\Decidesk\\Event\\DecisionRequestedEvent';
+	public const DECISION_REQUESTED_EVENTS = [
+		'\\OCA\\Decidiq\\Event\\DecisionRequestedEvent',
+		'\\OCA\\Decidesk\\Event\\DecisionRequestedEvent',
+	];
 
 	/**
 	 * This consumer app id, stamped on the request event as `sourceApp` and
@@ -163,9 +177,28 @@ public function __construct(
 	 * @spec openspec/specs/contract-decision-delegation/spec.md
 	 */
 	public function isDelegationConfigured(): bool {
-		return class_exists(self::DECISION_REQUESTED_EVENT);
+		return ($this->resolveRequestEventClass() !== null);
 	}//end isDelegationConfigured()
 
+	/**
+	 * The first request-event class that actually exists, or null.
+	 *
+	 * Resolving rather than assuming: this app can only follow the decision
+	 * app's namespace, and a hard-coded spelling turns a rename over there into
+	 * a silently disabled feature over here.
+	 *
+	 * @return string|null The event FQN, or null when the decision app is absent.
+	 */
+	private function resolveRequestEventClass(): ?string {
+		foreach (self::DECISION_REQUESTED_EVENTS as $candidate) {
+			if (class_exists($candidate) === true) {
+				return $candidate;
+			}
+		}
+
+		return null;
+	}//end resolveRequestEventClass()
+
 	/**
 	 * Raise a decidesk Decision for a contract approval or renewal.
 	 *
@@ -192,9 +225,17 @@ public function isDelegationConfigured(): bool {
 	 * It is a payload discriminator, not a second responsibility.
 	 */
 	public function submitForApproval(string $contractUuid, bool $isRenewal = false): string {
-		if ($this->isDelegationConfigured() === false) {
-			// Fail closed — never auto-approve when decidesk is not installed.
-			throw new RuntimeException('Contract approval delegation is not available (decidesk event contract not installed).');
+		// Resolve ONCE and narrow here, rather than calling
+		// isDelegationConfigured() and resolving again below. Two lookups of the
+		// same thing can disagree — and the second one has no guard, so a null
+		// would reach `new $eventClass(...)` as a call on null. Psalm caught
+		// exactly that shape.
+		$eventClass = $this->resolveRequestEventClass();
+		if ($eventClass === null) {
+			// Fail closed — never auto-approve when the decision app is absent.
+			throw new RuntimeException(
+				'Contract approval delegation is not available (decision event contract not installed).'
+			);
 		}
 
 		$contract = $this->loadContract(contractUuid: $contractUuid);
@@ -209,7 +250,6 @@ public function submitForApproval(string $contractUuid, bool $isRenewal = false)
 			$decisionType = self::DECISION_TYPE_RENEWAL;
 		}
 
-		$eventClass = self::DECISION_REQUESTED_EVENT;
 		$event = new $eventClass(
 			self::SOURCE_APP,
 			self::SUBJECT_REGISTER,
diff --git a/tests/Unit/Service/ContractApprovalServiceTest.php b/tests/Unit/Service/ContractApprovalServiceTest.php
index 4ad9e0ab..47990c58 100644
--- a/tests/Unit/Service/ContractApprovalServiceTest.php
+++ b/tests/Unit/Service/ContractApprovalServiceTest.php
@@ -80,18 +80,45 @@ private function makeService(): ContractApprovalService {
 	}//end makeService()
 
 	/**
-	 * Delegation is NOT configured when decidesk's event class is absent.
+	 * Delegation is NOT configured when NO spelling of the event class exists.
 	 *
-	 * The decidesk app is not installed in the unit-test autoload scope, so the
-	 * class_exists guard returns false — delegation is reported unconfigured.
+	 * The decision app is not installed in the unit-test autoload scope, so
+	 * every candidate misses and delegation is reported unconfigured.
 	 *
 	 * @return void
 	 */
 	public function testDelegationNotConfiguredWhenDecideskAbsent(): void {
-		$this->assertFalse(class_exists(ContractApprovalService::DECISION_REQUESTED_EVENT));
+		foreach (ContractApprovalService::DECISION_REQUESTED_EVENTS as $candidate) {
+			$this->assertFalse(class_exists($candidate));
+		}
+
 		$this->assertFalse($this->makeService()->isDelegationConfigured());
 	}//end testDelegationNotConfiguredWhenDecideskAbsent()
 
+	/**
+	 * The candidate list names the CURRENT namespace and still names the old one.
+	 *
+	 * Pinning one spelling is what broke this: the decision app renamed to
+	 * OCA\Decidiq without an alias, `isDelegationConfigured()` went false on an
+	 * instance where the app was installed, and contract approvals silently
+	 * stopped delegating. An app cannot move another app's class name — it can
+	 * only follow it — so the property worth holding is that this LISTS the
+	 * spellings, newest first, rather than pinning one.
+	 *
+	 * @return void
+	 */
+	public function testTheEventCandidatesFollowTheRename(): void {
+		$candidates = ContractApprovalService::DECISION_REQUESTED_EVENTS;
+
+		$this->assertGreaterThanOrEqual(2, count($candidates));
+		$this->assertStringContainsString('Decidiq', $candidates[0], 'The current namespace must be tried first.');
+		$this->assertStringContainsString(
+			'Decidesk',
+			implode(' ', $candidates),
+			'The old namespace must stay listed until no supported install ships it.'
+		);
+	}//end testTheEventCandidatesFollowTheRename()
+
 	/**
 	 * Submitting fails CLOSED (throws) when decidesk's event class is absent —
 	 * the contract is never advanced and status is never set to Actief, and the