Invalid QR Code

steps i do is

1- generate basic invoice
2-GenerateInvoiceHash(xmlInvoice);

3-AddUBLExtensions(xmlInvoice, _hash.Hash, );

4- SignGeneratedInvoiceHash(updatedXml.OuterXml);

5-add hash to invoice

XmlNamespaceManager nsmgr = new XmlNamespaceManager(updatedXml.NameTable);
nsmgr.AddNamespace(“ext”, “urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2”);
nsmgr.AddNamespace(“sig”, “urn:oasis:names:specification:ubl:schema:xsd:CommonSignatureComponents-2”);
nsmgr.AddNamespace(“sac”, “urn:oasis:names:specification:ubl:schema:xsd:SignatureAggregateComponents-2”);
nsmgr.AddNamespace(“ds”, “XML-Signature Syntax and Processing);
XmlNodeList lst = updatedXml.SelectNodes(“//ext:UBLExtensions/ext:UBLExtension/ext:ExtensionContent/sig:UBLDocumentSignatures/sac:SignatureInformation/ds:Signature/ds:SignedInfo/ds:Reference[@URI=‘#xadesSignedProperties’]/ds:DigestValue”, nsmgr);

XmlNode dig = lst[0];
dig.InnerText = _Fsign.Steps.Where(x=>x.StepName== “Populate Signed Signature Properties”).FirstOrDefault().ResultedValue;

XmlNode SignatureValue = updatedXml.GetElementsByTagName(“ds:SignatureValue”).Item(0);

SignatureValue.InnerText= _Fsign.Steps.Where(x => x.StepName == “Generate Signature”).FirstOrDefault().ResultedValue;

XmlNode KeyInfo = updatedXml.GetElementsByTagName(“ds:X509Certificate”).Item(0);

KeyInfo.InnerText = _Fsign.Steps.Where(x => x.StepName == “Parse Certificate”).FirstOrDefault().ResultedValue;

6- CreateAdditionalDocumentReferences(updatedXml.OuterXml,bill, _hash.Hash) which contain the QR Generation

When try to validate the QR Code with TLV it pring thid data to me === TLV Validation ===
Tag: 1, Length: 31, Value: Tadawi Hospital Tadawi Hospital
Seller Name: ‘Tadawi Hospital Tadawi Hospital’ (Length: 31)
Tag: 2, Length: 15, Value: 399999999900003
VAT Number: ‘399999999900003’ (Should be 15 digits)
Tag: 3, Length: 0, Value:
Timestamp: ‘’
WARNING: Timestamp format may be invalid

Tag: 4, Length: 6, Value: 460.00
Invoice Total: ‘460.00’
Tag: 5, Length: 5, Value: 60.00
VAT Total: ‘60.00’
Tag: 6, Length: 44, Value: 5S+WPF8GNIqSc33l0eWZBrfLtCMl+TyG8ifnf+6d3RM=
Invoice Hash: ‘5S+WPF8GNIqSc33l0eWZBrfLtCMl+TyG8ifnf+6d3RM=’ (Length: 44)
Tag: 7, Length: 96, Value: MEUCIQCOjK+eJMaP9/0aeuzlE8KLwueVj1NZh1tlzSLuhAUO/AIgGB3Dxqz3Tly3xSYEr7LbryILZO306ng1AsiBgAtUcs4=
Tag: 8, Length: 88, Value: 0V0►:spade_suit:*?H?=:slight_smile::smiling_face::spade_suit::club_suit:+?:diamond_suit:
:heart:B​:diamond_suit:??kD??R♦?3???$♂UH)|T?s??k?⌂??1????6\??♫???'h?j?j‼???<? ??{u)?Tx "??♣???w(q?↕?0>?☻?, Value: 0E☻ ??6?D??pl?e?t???▲????JI SUCCESS: All required TLV tags present UTF-8 decoded: ☺▼Tadawi Hospital Tadawi Hospital☻☼399999999900003♥♦♠460.00♣♣60.00♠,5S+WPF8GNIqSc33l0eWZBrfLtCMl+TyG8ifnf+6d3RM=MEUCIQCOjK+eJMaP9/0aeuzlE8KLwueVj1NZh1tlzSLuhAUO/AIgGB3Dxqz3Tly3xSYEr7LbryILZO306ng1AsiBgAtUcs4X0V0►:spade_suit:*?H?=:slight_smile::smiling_face::spade_suit::club_suit:+:diamond_suit:
"??:club_suit:???w(q?:up_down_arrow:?0>?:slight_smile:?:male_sign:UH)|T?s??k?⌂??1???6??♫???'h?j?j​:double_exclamation_mark:???<? ??{u)?Tx G0E​:slight_smile: ??6?D??pl?e?t???▲???JI
Why i got the Time Stamp Empty i validate on the Issue Date and Issue time and it returned with valid values ? Please can you help in This

now the timestamp returned successfully when i update to sdk einvoicing-sdk-DotNet-238-R3.4.5 but still the QR Code is Invalid