diff --git a/lib/types/account-types.js b/lib/types/account-types.js
--- a/lib/types/account-types.js
+++ b/lib/types/account-types.js
@@ -103,7 +103,7 @@
   ...LogInExtraInfo,
   +username: string,
   +password: string,
-  +source?: ?LogInActionSource,
+  +source: LogInActionSource,
 };
 
 export type LogInRequest = {
@@ -136,7 +136,7 @@
   +userInfos: $ReadOnlyArray<UserInfo>,
   +calendarResult: CalendarResult,
   +updatesCurrentAsOf: number,
-  +source?: ?LogInActionSource,
+  +source: LogInActionSource,
 };
 
 export type UpdatePasswordRequest = {
diff --git a/lib/utils/config.js b/lib/utils/config.js
--- a/lib/utils/config.js
+++ b/lib/utils/config.js
@@ -11,7 +11,7 @@
   +resolveInvalidatedCookie: ?(
     callServerEndpoint: CallServerEndpoint,
     dispatchRecoveryAttempt: DispatchRecoveryAttempt,
-    source?: LogInActionSource,
+    source: LogInActionSource,
   ) => Promise<void>,
   +setCookieOnRequest: boolean,
   +setSessionIDOnRequest: boolean,
diff --git a/native/account/resolve-invalidated-cookie.js b/native/account/resolve-invalidated-cookie.js
--- a/native/account/resolve-invalidated-cookie.js
+++ b/native/account/resolve-invalidated-cookie.js
@@ -13,7 +13,7 @@
 async function resolveInvalidatedCookie(
   callServerEndpoint: CallServerEndpoint,
   dispatchRecoveryAttempt: DispatchRecoveryAttempt,
-  source?: LogInActionSource,
+  source: LogInActionSource,
 ) {
   const keychainCredentials = await fetchNativeKeychainCredentials();
   if (!keychainCredentials) {