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

# Market Data Request Reject

> Rejection of a market data subscription request via FIX

<div className="api-banner">
  <span className="api-protocol fix">FIX</span>
  <span className="api-detail">session: market-data</span>
  <span className="api-tag">35=Y</span>
</div>

When a [Market Data Request](/exchange/api-reference/unified-fix/mdr) cannot be honored, the FIX Server responds with this reject message.

***

<ResponseField name="header" type="" required>35=`Y`</ResponseField>

<ResponseField name="262 - MDReqID" type="string" required>
  Unique request identifier.
</ResponseField>

<ResponseField name="281 - MDReqRejReason" type="integer" required>
  **Possible values:**

  * `0` : Unknown Symbol
  * `1` : Duplicate MDReqID
  * `4` : Unsupported SubscriptionRequestType
  * `5` : Unsupported MarketDepth
  * `6` : Unsupported MDUpdateType
  * `8` : Unsupported MDEntryType
  * `A` : Unsupported Scope
  * `B` : Level3 not available
  * `C` : Trade not available on this request
</ResponseField>

<ResponseField name="58 - Text" type="string">
  Full description for rejection.
</ResponseField>

<ResponseField name="trailer" type="" required />

<CodeGroup>
  ```text Unknown Symbol (MDReqRejReason=0) theme={null}
  8=FIX.4.4|9=102|35=Y|34=3|49=KRAKEN-MD|56=CLIENT|52=20260407-14:32:01.000|262=MDSUB1|281=0|58=Unknown symbol: FOO/BAR|10=115|
  ```

  ```text Duplicate MDReqID (MDReqRejReason=1) theme={null}
  8=FIX.4.4|9=96|35=Y|34=4|49=KRAKEN-MD|56=CLIENT|52=20260407-14:32:01.000|262=MDSUB1|281=1|58=Duplicate MDReqID|10=106|
  ```

  ```text Unsupported Market Depth (MDReqRejReason=5) theme={null}
  8=FIX.4.4|9=108|35=Y|34=5|49=KRAKEN-MD|56=CLIENT|52=20260407-14:32:01.000|262=MDSUB2|281=5|58=Unsupported market depth: 100|10=006|
  ```
</CodeGroup>