diff --git a/lib/types/request-types.js b/lib/types/request-types.js
--- a/lib/types/request-types.js
+++ b/lib/types/request-types.js
@@ -276,13 +276,13 @@
 export type OlmSessionInitializationInfo = {
   +prekey: string,
   +prekeySignature: string,
-  +oneTimeKey: string,
+  +oneTimeKey: ?string,
 };
 export const olmSessionInitializationInfoValidator: TInterface<OlmSessionInitializationInfo> =
   tShape<OlmSessionInitializationInfo>({
     prekey: t.String,
     prekeySignature: t.String,
-    oneTimeKey: t.String,
+    oneTimeKey: t.maybe(t.String),
   });
 
 export type GetOlmSessionInitializationDataResponse = {
diff --git a/lib/utils/crypto-utils.js b/lib/utils/crypto-utils.js
--- a/lib/utils/crypto-utils.js
+++ b/lib/utils/crypto-utils.js
@@ -73,10 +73,6 @@
     }
     const recipientDeviceID = primaryIdentityPublicKeys.ed25519;
 
-    if (!keys.contentInitializationInfo.oneTimeKey) {
-      console.log(`One-time key is missing for device ${recipientDeviceID}`);
-      continue;
-    }
     try {
       const { sessionVersion, encryptedData } =
         await olmAPI.contentOutboundSessionCreator(
diff --git a/native/identity-service/identity-service-context-provider.react.js b/native/identity-service/identity-service-context-provider.react.js
--- a/native/identity-service/identity-service-context-provider.react.js
+++ b/native/identity-service/identity-service-context-provider.react.js
@@ -168,13 +168,6 @@
           payloadSignature: resultObject?.payloadSignature,
         };
 
-        if (!keyserverKeys.contentInitializationInfo.oneTimeKey) {
-          throw new Error('Missing content one time key');
-        }
-        if (!keyserverKeys.notifInitializationInfo.oneTimeKey) {
-          throw new Error('Missing notif one time key');
-        }
-
         return assertWithValidator(
           keyserverKeys,
           deviceOlmOutboundKeysValidator,
@@ -207,17 +200,6 @@
               const deviceID =
                 identityKeysBlob.primaryIdentityPublicKeys.ed25519;
 
-              if (
-                !outboundKeysInfo.oneTimeContentPrekey ||
-                !outboundKeysInfo.oneTimeNotifPrekey
-              ) {
-                console.log(`Missing one time key for device ${deviceID}`);
-                return {
-                  deviceID,
-                  keys: null,
-                };
-              }
-
               const deviceKeys = {
                 identityKeysBlob,
                 contentInitializationInfo: {
diff --git a/web/grpc/identity-service-client-wrapper.js b/web/grpc/identity-service-client-wrapper.js
--- a/web/grpc/identity-service-client-wrapper.js
+++ b/web/grpc/identity-service-client-wrapper.js
@@ -173,13 +173,6 @@
         payloadSignature: identityInfo?.getPayloadSignature(),
       };
 
-      if (!keyserverKeys.contentInitializationInfo.oneTimeKey) {
-        throw new Error('Missing content one time key');
-      }
-      if (!keyserverKeys.notifInitializationInfo.oneTimeKey) {
-        throw new Error('Missing notif one time key');
-      }
-
       return assertWithValidator(keyserverKeys, deviceOlmOutboundKeysValidator);
     };
 
@@ -212,17 +205,6 @@
           return null;
         }
 
-        if (
-          !outboundKeysInfo.oneTimeContentPrekey ||
-          !outboundKeysInfo.oneTimeNotifPrekey
-        ) {
-          console.log(`Missing one time key for device ${deviceID}`);
-          return {
-            deviceID,
-            keys: null,
-          };
-        }
-
         const deviceKeys = {
           identityKeysBlob: payload ? JSON.parse(payload) : null,
           contentInitializationInfo: {