Error making a Registration REST call

Our internal Web team are trying out the various REST calls available, and have run into trouble with "Web/Registration/{sessionKey}/Register". We create a valid {sessionKey} using "Web/Session" and populate the Registration body with the following test data:

{
"Address": {
"AddressTypeId": 3,
"City": "\"\"",
"PostalCode": "\"\"",
"Street1": "\"\""
},
"ConstituentTypeId": 1,
"ElectronicAddress": {
"Address": "a@b.com"
},
"FirstName": "Test",
"LastName": "ABCDE",
"OriginalSourceId": 4,
"WebLogin": {
"Login": "a@b.com",
"LoginTypeId": 1,
"Password": "Pa$$w0rd"
}
}
However, running the call produces a 400 error with the Response Descipription: "profile name is not valid" (and far too much error text to paste here)
Has anyone seen this or know what we're doing wrong? We are currently on v 14.1.2
Thanks,
Steve
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