Groups and Settings > Reports > List View > Device Inventory. This will tell you the RegistrationDate. 

Thank you , but this is not what I am looking for. I am looking for the REST API call to retrieve Registration Date.

I found :

API URI – https://host/api/system/users/enrolleddevices/search?organizationgroupid=
{organizationgroupid}&organizationgroup={organizationgroup}&platform={platform}&customattributes=
{customattributes}&serialnumber={serialnumber}&seensince={seensince}&seentill={seentill}&enrolledsince=
{enrolledsince}&enrolledtill={enrolledtill}

 https://host/api/system/users/enrolleddevices/search

Allt the data comes fine except RegistrationDate that comes as 01/01/0001 00:00:00

By Registration do you mean enrolment? The enrolment date is included in that search in the {enrolledsince} attribute

No RegistrationDate is not EnrollmentDate. They are 2 different fields. RegistrationDate is when Apple registers the device in DEP and Enrollment Date is when the users enroll the device with Airwatch.

This is the API CI call I use to retrieve both dates for a report in Power BI. The RegistrationDate however comes as 0001/01/01 

Search Enrolled Device
Functionality – Retrieves enrolled device details for the query information provided in the request.
HTTP Method – GET
API URI – https://host/api/system/users/enrolleddevices/search?organizationgroupid=
{organizationgroupid}&organizationgroup={organizationgroup}&platform={platform}&customattributes=
{customattributes}&serialnumber={serialnumber}&seensince={seensince}&seentill={seentill}&enrolledsince=
{enrolledsince}&enrolledtill={enrolledtill}
l Exact Match Parameter – platform
l Pattern (Contains) Match Parameter – organizationgroupid, organizationgroup, customattributes, serialnumber,
seensince, seentill, enrolledsince, enrolledtill
Request – N/A

<EnrolledDevices xmlns="http://www.air-watch.com/servicemodel/resources">
<EnrolledDeviceInfoList>
<EnrolledDeviceDetails>
<DeviceID>Numeric</DeviceID>
<SerialNumber>String</SerialNumber>
<AssetNumber>String</AssetNumber>
<FriendlyName>String</FriendlyName>
<UserName>String</UserName>
<EnrolledDate>Datetime</EnrolledDate>
<RegistrationDate>Datetime</RegistrationDate>
<LastSeen>Datetime</LastSeen>
<Platform>String</Platform>
<OrganizationGroup>String</OrganizationGroup>
<CustomAttributes>
<CustomAttribute>
<Name>String</Name>
<Application>String</Application>
<Value>String</Value>
</CustomAttribute>
<CustomAttribute>
<Name>String</Name>
<Application>String</Application>
<Value>String</Value>
</CustomAttribute>
</CustomAttributes>
</EnrolledDeviceDetails>
</EnrolledDeviceInfoList>
</EnrolledDevices>

Did you find a solution to get the Registration Date? I have a requirement to pull the registration date to CMDB CIs. Everything else I need can be fetched from https://<id>.awmdm.com/API/mdm/devices/search, I just can't find the endpoint address to get registration date.

Checked on two different environments and both have the same issue you describe, Registration date returned via the enrolleddevicces call is 0001/01/01 for all records.

I know this doesn't really help you but at least you know its a general issue and not specific to your environment. 

I have asked the PM for APIs to have a look and add it to the list.

There looks to be two APIs you can use:

1. https://host/api/system/users/enrolleddevices/search
   which returns
   
   {

   "EnrolledDeviceInfoList": [

   {

   "DeviceID": 1,

   "SerialNumber": "RZ1G124JZ6W",

   "AssetNumber": "ea856771ba6277bfca16528a79c5ce1f",

   "FriendlyName": "TestUser's iPhone",

   "UserName": "TestUser",

   "EnrolledDate": "04/24/2017",

   "RegistrationDate": "04/24/2017",

   "LastSeen": "04/24/2017",

   "Platform": "Apple",

   "OrganizationGroup": "TestOg",

   "CustomAttributes": [

   {

   "Name": "identity.deviceModel",

   "Value": "TC25",

   "Source": "Device",

   "Application": "com.airwatch.androidagent.identity.xml"

   }

   ]

   }

   ]

   }
   
   
2.  https://host/api/system/users/registereddevices/search

if neither of these return the correct details, please confirm that the device was registered by DEP into UEM. I think you can see the devices listed in the Devices > Lifecycle > Enrollment Status page. If they are showing then please log a support ticket so that we can get this escalated and assigned to the correct engineer.