diff --git a/src/app/(proper_react)/(redesign)/(authenticated)/admin/fxa/actions.tsx b/src/app/(proper_react)/(redesign)/(authenticated)/admin/fxa/actions.tsx
index afe06de11a..dbb002176e 100644
--- a/src/app/(proper_react)/(redesign)/(authenticated)/admin/fxa/actions.tsx
+++ b/src/app/(proper_react)/(redesign)/(authenticated)/admin/fxa/actions.tsx
@@ -10,6 +10,7 @@ import { getServerSession } from "../../../../../functions/server/getServerSessi
 import { isAdmin } from "../../../../../api/utils/auth";
 import { logger } from "@sentry/utils";
 import { captureException } from "@sentry/node";
+import { getSubscriberByFxaUid } from "../../../../../../db/tables/subscribers";
 
 export async function getAttachedClientsAction() {
   const session = await getServerSession();
@@ -17,14 +18,23 @@ export async function getAttachedClientsAction() {
   if (
     !session?.user?.email ||
     !isAdmin(session.user.email) ||
-    process.env.APP_ENV === "production"
+    process.env.APP_ENV === "production" ||
+    typeof session?.user?.subscriber?.fxa_uid !== "string"
   ) {
     return notFound();
   }
 
+  const subscriber = await getSubscriberByFxaUid(
+    session.user.subscriber.fxa_uid,
+  );
+  if (!subscriber) {
+    logger.error("admin_fxa_no_subscriber_found");
+    return notFound();
+  }
+
   try {
     const attachedClients = await getAttachedClients(
-      session?.user.subscriber?.fxa_access_token ?? "",
+      subscriber.fxa_access_token ?? "",
     );
     return attachedClients;
   } catch (error) {
diff --git a/src/app/(proper_react)/(redesign)/(authenticated)/user/(dashboard)/settings/actions.ts b/src/app/(proper_react)/(redesign)/(authenticated)/user/(dashboard)/settings/actions.ts
index ee268fbc96..f0007b3c02 100644
--- a/src/app/(proper_react)/(redesign)/(authenticated)/user/(dashboard)/settings/actions.ts
+++ b/src/app/(proper_react)/(redesign)/(authenticated)/user/(dashboard)/settings/actions.ts
@@ -176,7 +176,20 @@ export async function onDeleteAccount() {
     };
   }
 
-  await deleteAccount(session.user.subscriber);
+  const subscriber = await getSubscriberByFxaUid(
+    session.user.subscriber.fxa_uid,
+  );
+  if (!subscriber) {
+    logger.error(
+      `Tried to delete an account with a session that could not be linked to a subscriber.`,
+    );
+    return {
+      success: false,
+      error: "delete-account-with-invalid-session",
+      errorMessage: `User tried to delete their account, but we could not find it.`,
+    };
+  }
+  await deleteAccount(subscriber);
 
   // Tell the front page to display an "account deleted" notification:
   cookies().set("justDeletedAccount", "justDeletedAccount", {
@@ -202,7 +215,20 @@ export async function onApplyCouponCode() {
     };
   }
 
-  const result = await applyCurrentCouponCode(session.user.subscriber);
+  const subscriber = await getSubscriberByFxaUid(
+    session.user.subscriber.fxa_uid,
+  );
+  if (!subscriber) {
+    logger.error(
+      `Tried to apply a coupon code with a session that could not be linked to a subscriber.`,
+    );
+    return {
+      success: false,
+      error: "apply-coupon-code-with-invalid-session",
+      errorMessage: `User tried to apply a coupon code, but we could not find their account.`,
+    };
+  }
+  const result = await applyCurrentCouponCode(subscriber);
   return result;
 }
 
diff --git a/src/app/functions/server/applyCoupon.ts b/src/app/functions/server/applyCoupon.ts
index d337ac75ca..9731976260 100644
--- a/src/app/functions/server/applyCoupon.ts
+++ b/src/app/functions/server/applyCoupon.ts
@@ -11,9 +11,7 @@ import {
 } from "../../../db/tables/subscriber_coupons";
 import { applyCoupon } from "../../../utils/fxa";
 
-export async function applyCurrentCouponCode(
-  subscriber: SubscriberRow | SerializedSubscriber,
-) {
+export async function applyCurrentCouponCode(subscriber: SubscriberRow) {
   logger.info("fxa_apply_coupon_code", {
     subscriber: subscriber.id,
   });
diff --git a/src/app/functions/server/deleteAccount.ts b/src/app/functions/server/deleteAccount.ts
index 4ac9229b8f..634fc12232 100644
--- a/src/app/functions/server/deleteAccount.ts
+++ b/src/app/functions/server/deleteAccount.ts
@@ -9,13 +9,10 @@ import {
   getOnerepProfileId,
 } from "../../../db/tables/subscribers";
 import { deactivateProfile } from "./onerep";
-import { SerializedSubscriber } from "../../../next-auth";
 import { deleteSubscription } from "../../../utils/fxa";
 import { record } from "./glean";
 
-export async function deleteAccount(
-  subscriber: SubscriberRow | SerializedSubscriber,
-) {
+export async function deleteAccount(subscriber: SubscriberRow) {
   logger.info("fxa_delete_user", {
     subscriber: subscriber.id,
   });
diff --git a/src/app/functions/server/user.ts b/src/app/functions/server/user.ts
index ee4bd38d12..108ab78ccf 100644
--- a/src/app/functions/server/user.ts
+++ b/src/app/functions/server/user.ts
@@ -4,10 +4,16 @@
 
 import { Session } from "next-auth";
 import { getBillingAndSubscriptions } from "../../../utils/fxa";
+import { getSubscriberByFxaUid } from "../../../db/tables/subscribers";
 
 /* c8 ignore start */
 export async function checkUserHasMonthlySubscription(user: Session["user"]) {
-  if (!user.subscriber?.fxa_access_token) {
+  if (!user.subscriber?.fxa_uid) {
+    console.error("FXA UID not set");
+    return false;
+  }
+  const subscriber = await getSubscriberByFxaUid(user.subscriber.fxa_uid);
+  if (!subscriber || !subscriber.fxa_access_token) {
     console.error("FXA token not set");
     return false;
   }
@@ -18,7 +24,7 @@ export async function checkUserHasMonthlySubscription(user: Session["user"]) {
   }
 
   const billingAndSubscriptionInfo = await getBillingAndSubscriptions(
-    user.subscriber.fxa_access_token,
+    subscriber.fxa_access_token,
   );
 
   if (billingAndSubscriptionInfo === null) {