Xdocument read from linq: "enumeration yielded no results"

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C#

XML

I have the following XML document that I am trying to read using XDocument. See below code:

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<Document xmlns='urn:iso:std:iso:20022:tech:xsd:pain.002.001.03' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'>
  <CstmrPmtStsRpt>
    <GrpHdr>
      <MsgId>21169931</MsgId>
      <CreDtTm>2018-11-16T13:40:12</CreDtTm>
      <InitgPty>
        <Nm>Standard Bank SA</Nm>
        <Id>
          <OrgId>
            <BICOrBEI>SBZAZAJJXXX</BICOrBEI>
          </OrgId>
        </Id>
      </InitgPty>
    </GrpHdr>
    <OrgnlGrpInfAndSts>
      <OrgnlMsgId>KESD00017-Domestic Base-300732</OrgnlMsgId>
      <OrgnlMsgNmId>PAIN.001.001.03</OrgnlMsgNmId>
      <OrgnlCreDtTm>2018-11-16T11:11:25</OrgnlCreDtTm>
      <OrgnlNbOfTxs>1</OrgnlNbOfTxs>
      <OrgnlCtrlSum>15000000.00</OrgnlCtrlSum>
      <GrpSts>RJCT</GrpSts>
      <StsRsnInf>
        <Rsn>
          <Cd>NARR</Cd>
        </Rsn>
        <AddtlInf>Error: 4022</AddtlInf>
        <AddtlInf>Duplicate File</AddtlInf>
      </StsRsnInf>
    </OrgnlGrpInfAndSts>
  </CstmrPmtStsRpt>
</Document>

I need to get the information from only 2 tags, namely: <orgnlmsgid> and <addtlinf>

The data should thus be like

string id = "KESD00017-Domestic Base-300732";
string info = "Error: 4022, Duplicate File"; // Concat both separated with a comma.

How can I achieve this?

What I have tried:

I have tried the below just for the id tag but I get the notification: "Empty = "Enumeration yielded no results"

var id = (
from c in doc.Descendants("OrgnlGrpInfAndSts")
select c.Element("OrgnlMsgId").Value
);