[Python] Errors calling createinboundplan in python-amazon-sp-api

I'm totally stumped trying to migrate to the new SP API Inbound Fulfillment API at the first step (createInboundPlan). Here's the payload just before it's POSTed to /inboundPlans

"body": {
"destinationMarketplaces": [
"A1F83G8C2ARO7P"
],
"items": [
{
"labelOwner": "SELLER",
"msku": "GNT~300506-9-10~RubiesDisneyFroze",
"prepOwner": "SELLER",
"quantity": 24
},
{
"labelOwner": "SELLER",
"msku": "GNT~6061626~SpinMasterGamesSkillm",
"prepOwner": "SELLER",
"quantity": 8
},
{
"labelOwner": "SELLER",
"msku": "GNT~F2934~MyLittlePonyPlayDoh",
"prepOwner": "SELLER",
"quantity": 24
},
{
"labelOwner": "SELLER",
"msku": "GNT~HKV33~PollyPocketMiniToysCampAdve",
"prepOwner": "SELLER",
"quantity": 32
},
{
"labelOwner": "SELLER",
"msku": "GNT~TM15537~McFarlaneToysDCMultiverse",
"prepOwner": "SELLER",
"quantity": 6
},
{
"labelOwner": "SELLER",
"msku": "SMF~70604~Playmobil70596CityLifeF",
"prepOwner": "SELLER",
"quantity": 24
}
],
"name": "TEST",
"sourceAddress": {
"addressLine1": "Unit 2 49 Quarry Road",
"addressLine2": "Ballydrain",
"city": "Lisbane",
"companyName": "Ardmillan Trading Limited",
"countryCode": "GB",
"email": "paul@email.co.uk",
"name": "Paul Anderson",
"phoneNumber": "07841903333",
"postalCode": "BT23 6QQ",
"stateOrProvinceCode": "Co. Down"
}
},
"path": "/inbound/fba/<version>/inboundPlans",
"method": "POST"
}


It keeps failing with the following error, which I expect means I'm passing in my body data in the wrong format, but I can't see why. Anyone able to point me in the right direction, or show me a piece of working sample code?

sp_api.base.exceptions.SellingApiBadRequestException: [{'code': 'InvalidInput', 'message': "9 validation errors detected: Value '[]' at 'request.destinationMarketplaces' failed to satisfy constraint: Member must have length greater than or equal to 1; Value at 'request.sourceAddress.phoneNumber' failed to satisfy constraint: Member must have length greater than or equal to 1; Value at 'request.sourceAddress.city' failed to satisfy constraint: Member must have length greater than or equal to 1; Value at 'request.sourceAddress.countryCode' failed to satisfy constraint: Member must satisfy regular expression pattern: [A-Z]{2}; Value at 'request.sourceAddress.countryCode' failed to satisfy constraint: Member must have length greater than or equal to 2; Value at 'request.sourceAddress.postalCode' failed to satisfy constraint: Member must have length greater than or equal to 1; Value at 'request.sourceAddress.name' failed to satisfy constraint: Member must have length greater than or equal to 1; Value at 'request.sourceAddress.addressLine1' failed to satisfy constraint: Member must have length greater than or equal to 1; Value '[]' at 'request.items' failed to satisfy constraint: Member must have length greater than or equal to 1", 'details': ''}]

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