I tried to create the a data folder and data extension via soap api. After the response returns OK, I am still not able to view it in marketing cloud ui. Here is the request and response.
<Envelope xmlns="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Header>
<fueloauth>{{access_token}}</fueloauth>
</Header>
<Body>
<CreateRequest xmlns="http://exacttarget.com/wsdl/partnerAPI">
<Options/>
<Objects xmlns:ns1="http://exacttarget.com/wsdl/partnerAPI" xsi:type="DataFolder">
<CustomerKey>api_folder</CustomerKey>
<ParentFolder>
<ID>{{folder_id}}</ID>
</ParentFolder>
<Name>api_folder</Name>
<Description>api_folder</Description>
<ContentType>dataextension</ContentType>
<IsActive>true</IsActive>
<IsEditable>true</IsEditable>
<AllowChildren>true</AllowChildren>
</Objects>
</CreateRequest>
</Body>
then i got the response
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
<soap:Header>
<wsa:Action>CreateResponse</wsa:Action>
<wsa:MessageID>urn:uuid:9dabdf03-fd92-4243-85a1-845f68974c47</wsa:MessageID>
<wsa:RelatesTo>urn:uuid:ceb0d6b0-0404-42df-94d3-d4b4b14d3c9b</wsa:RelatesTo>
<wsa:To>http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</wsa:To>
<wsse:Security>
<wsu:Timestamp wsu:Id="Timestamp-c6f6793f-02df-4162-9f8e-dfab100ba803">
<wsu:Created>2022-08-31T08:37:40Z</wsu:Created>
<wsu:Expires>2022-08-31T08:42:40Z</wsu:Expires>
</wsu:Timestamp>
</wsse:Security>
</soap:Header>
<soap:Body>
<CreateResponse xmlns="http://exacttarget.com/wsdl/partnerAPI">
<Results>
<StatusCode>OK</StatusCode>
<StatusMessage>Folder created successfully.</StatusMessage>
<OrdinalID>0</OrdinalID>
<NewID>{{new_id}}</NewID>
<NewObjectID>{{ne_object_id}}</NewObjectID>
</Results>
<RequestID>{{request_i}}</RequestID>
<OverallStatus>OK</OverallStatus>
</CreateResponse>
</soap:Body>
</soap:Envelope>
appreciate your help