> ## Documentation Index
> Fetch the complete documentation index at: https://docs.deribit.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Market Data Request Reject(Y) (Production FIX API)

> MarketDataRequestReject(Y) is the Deribit production FIX API server response when a MarketDataRequest is refused, listing reject reason codes and remediation.

If a [`Market Data Request`(`V`)](/fix-api/production/market-data-request) message is not
accepted, the exchange responds with a `Market Data Request Reject`(`Y`) message.

### Arguments

| Tag | Name | Type | Required | Comments |
| - | - | - | - | - |
| 58 | `Text` | String | No | Free format text string |
| 262 | `MDReqID` | String | Yes | ID of the original request |
| 281 | `MDReqRejReason` | char | Yes | Reason for the rejection of a `Market Data Request`(`V`).<p> Possible reasons: <ul><li>`0` = Unknown symbol</li><li>`1` = Duplicate MDReqID(`262`)</li><li>`2` = Insufficient Bandwidth</li><li>`3` = Insufficient Permissions</li><li>`4` = Unsupported SubscriptionRequestType(`263`)</li><li>`5` = Unsupported MarketDepth(`264`)</li><li>`6` = Unsupported MDUpdateType(`265`)</li><li>`7` = Unsupported AggregatedBook (`266`)</li><li>`8` = Unsupported MDEntryType(`269`)</li><li>`9` = Unsupported TradingSessionID(`336`)</li><li>`A` = Unsupported Scope(`546`)</li><li>`B` = Unsupported OpenCloseSettlFlag(`286`)</li><li>`C` = Unsupported MDImplicitDelete(`547`)</li><li>`D` = Insufficient credit </li></ul></p> |


## Related topics

- [Market Data Request(V) (Production FIX API)](/fix-api/production/market-data-request.md)
- [Reject(3) (Production FIX API)](/fix-api/production/reject.md)
- [Order Cancel Reject(9) (Production FIX API)](/fix-api/production/order-cancel-reject.md)
- [Market Data Snapshot (W) (Production FIX API)](/fix-api/production/market-data-snapshot.md)
- [Market Data Incremental Refresh(X) (Production FIX API)](/fix-api/production/market-data-incremental.md)