diff --git a/packages/cookie-banner/src/activation.ts b/packages/cookie-banner/src/activation.ts
index 5764b93a2..6416a8db2 100644
--- a/packages/cookie-banner/src/activation.ts
+++ b/packages/cookie-banner/src/activation.ts
@@ -314,53 +314,29 @@ function deactivateElement(el: Element, label?: string): void {
   }
 }
 
-const KNOWN_MULTI_PART_TLDS = new Set([
-  "co.uk",
-  "co.jp",
-  "co.kr",
-  "co.nz",
-  "co.za",
-  "co.in",
-  "co.id",
-  "com.au",
-  "com.br",
-  "com.cn",
-  "com.mx",
-  "com.tw",
-  "com.hk",
-  "com.sg",
-  "com.ar",
-  "com.co",
-  "com.tr",
-  "net.au",
-  "org.uk",
-  "org.au",
-  "ac.uk",
-  "gov.uk",
-  "ne.jp",
-  "or.jp",
-]);
-
-function getRootDomain(hostname: string): string {
+function getCandidateDomains(hostname: string): string[] {
   const parts = hostname.split(".");
-  if (parts.length <= 2) {
-    return parts.length === 2 ? "." + hostname : hostname;
+  if (parts.length <= 1) return [];
+
+  const candidates: string[] = [];
+  // Try progressively broader parent domains. The browser silently
+  // ignores attempts to clear cookies on public suffixes, so
+  // over-trying is safe and avoids maintaining a TLD list.
+  for (let i = 0; i < parts.length - 1; i++) {
+    candidates.push("." + parts.slice(i).join("."));
   }
 
-  const lastTwo = parts.slice(-2).join(".");
-  if (KNOWN_MULTI_PART_TLDS.has(lastTwo)) {
-    return "." + parts.slice(-3).join(".");
-  }
-
-  return "." + lastTwo;
+  return candidates;
 }
 
 function removeCookies(names: string[]): void {
-  const rootDomain = getRootDomain(location.hostname);
+  const domains = getCandidateDomains(location.hostname);
 
   for (const name of names) {
     document.cookie = `${name}=; path=/; max-age=0`;
-    document.cookie = `${name}=; path=/; domain=${rootDomain}; max-age=0`;
+    for (const domain of domains) {
+      document.cookie = `${name}=; path=/; domain=${domain}; max-age=0`;
+    }
   }
 }
 
diff --git a/packages/cookie-banner/src/client.ts b/packages/cookie-banner/src/client.ts
index 8c42195de..76284b3ea 100644
--- a/packages/cookie-banner/src/client.ts
+++ b/packages/cookie-banner/src/client.ts
@@ -153,7 +153,7 @@ export class CookieBannerClient {
     return this.consent !== null;
   }
 
-  async acceptAll(): Promise<ConsentRecord> {
+  acceptAll(): void {
     const cfg = this.config;
 
     const consentData: Record<string, boolean> = {};
@@ -161,10 +161,10 @@ export class CookieBannerClient {
       consentData[cat.name] = true;
     }
 
-    return this.recordConsent("ACCEPT_ALL", consentData);
+    this.recordConsent("ACCEPT_ALL", consentData);
   }
 
-  async rejectAll(): Promise<ConsentRecord> {
+  rejectAll(): void {
     const cfg = this.config;
 
     const consentData: Record<string, boolean> = {};
@@ -172,12 +172,10 @@ export class CookieBannerClient {
       consentData[cat.name] = cat.kind === "NECESSARY";
     }
 
-    return this.recordConsent("REJECT_ALL", consentData);
+    this.recordConsent("REJECT_ALL", consentData);
   }
 
-  async customize(
-    categories: Record<string, boolean>,
-  ): Promise<ConsentRecord> {
+  customize(categories: Record<string, boolean>): void {
     const cfg = this.config;
 
     const consentData: Record<string, boolean> = {};
@@ -185,39 +183,21 @@ export class CookieBannerClient {
       consentData[cat.name] = cat.kind === "NECESSARY" || !!categories[cat.name];
     }
 
-    return this.recordConsent("CUSTOMIZE", consentData);
+    this.recordConsent("CUSTOMIZE", consentData);
   }
 
-  private async recordConsent(
+  private recordConsent(
     action: ConsentAction,
     consentData: Record<string, boolean>,
-  ): Promise<ConsentRecord> {
+  ): void {
     const cfg = this.config;
-    const url = new URL(`${this.bannerId}/consents`, this.baseUrl);
-    const body = {
-      visitor_id: this.visitorId,
-      version: cfg.version,
-      action,
-      consent_data: consentData,
-    };
-
-    let record: ConsentRecord | null = null;
-    try {
-      record = await fetchJSON<ConsentRecord>(url, {
-        method: "POST",
-        body,
-      });
-      void flush(this.bannerId);
-    } catch {
-      enqueue(this.bannerId, url.href, body);
-    }
 
     this.consent = {
       visitor_id: this.visitorId,
       version: cfg.version,
       action,
       consent_data: consentData,
-      created_at: record?.created_at ?? "",
+      created_at: "",
     };
 
     setConsentCookie(
@@ -232,12 +212,16 @@ export class CookieBannerClient {
 
     this.activate(consentData);
 
-    return record ?? {
-      id: "",
+    const url = new URL(`${this.bannerId}/consents`, this.baseUrl);
+    const body = {
       visitor_id: this.visitorId,
+      version: cfg.version,
       action,
-      created_at: "",
+      consent_data: consentData,
     };
+    void fetchJSON<ConsentRecord>(url, { method: "POST", body })
+      .then(() => void flush(this.bannerId))
+      .catch(() => enqueue(this.bannerId, url.href, body));
   }
 
   private activate(consentData: Record<string, boolean>): void {
diff --git a/packages/cookie-banner/src/components/buttons.ts b/packages/cookie-banner/src/components/buttons.ts
index e3a4ba8ff..ca87dba24 100644
--- a/packages/cookie-banner/src/components/buttons.ts
+++ b/packages/cookie-banner/src/components/buttons.ts
@@ -34,32 +34,30 @@ class ProboActionButton extends ProboElement {
 export class ProboAcceptButton extends ProboActionButton {
   protected handleClick = (): void => {
     if (!this.root) return;
-    void this.root.client.acceptAll().then(() => {
-      this.root!.setState("hidden");
-      this.root!.dispatchEvent(
-        new CustomEvent("probo-consent", {
-          bubbles: true,
-          composed: true,
-          detail: { action: "ACCEPT_ALL" },
-        }),
-      );
-    });
+    this.root.client.acceptAll();
+    this.root.setState("hidden");
+    this.root.dispatchEvent(
+      new CustomEvent("probo-consent", {
+        bubbles: true,
+        composed: true,
+        detail: { action: "ACCEPT_ALL" },
+      }),
+    );
   };
 }
 
 export class ProboRejectButton extends ProboActionButton {
   protected handleClick = (): void => {
     if (!this.root) return;
-    void this.root.client.rejectAll().then(() => {
-      this.root!.setState("hidden");
-      this.root!.dispatchEvent(
-        new CustomEvent("probo-consent", {
-          bubbles: true,
-          composed: true,
-          detail: { action: "REJECT_ALL" },
-        }),
-      );
-    });
+    this.root.client.rejectAll();
+    this.root.setState("hidden");
+    this.root.dispatchEvent(
+      new CustomEvent("probo-consent", {
+        bubbles: true,
+        composed: true,
+        detail: { action: "REJECT_ALL" },
+      }),
+    );
   };
 }
 
diff --git a/packages/cookie-banner/src/components/preference-panel.ts b/packages/cookie-banner/src/components/preference-panel.ts
index 989f8d013..247252189 100644
--- a/packages/cookie-banner/src/components/preference-panel.ts
+++ b/packages/cookie-banner/src/components/preference-panel.ts
@@ -78,15 +78,14 @@ export class ProboSaveButton extends ProboElement {
   private handleClick = (): void => {
     if (!this.root) return;
     const draft = { ...this.root.consentDraft };
-    void this.root.client.customize(draft).then(() => {
-      this.root!.setState("hidden");
-      this.root!.dispatchEvent(
-        new CustomEvent("probo-consent", {
-          bubbles: true,
-          composed: true,
-          detail: { action: "CUSTOMIZE", consent_data: draft },
-        }),
-      );
-    });
+    this.root.client.customize(draft);
+    this.root.setState("hidden");
+    this.root.dispatchEvent(
+      new CustomEvent("probo-consent", {
+        bubbles: true,
+        composed: true,
+        detail: { action: "CUSTOMIZE", consent_data: draft },
+      }),
+    );
   };
 }