Unable to enroll test user in Garden FI

Question

I just signed up for a developer account today and created a test user. When trying to enroll the test user in Garden FI, I get the following error message: Oops, something went wrong on our end. Please try again.

Inspecting the network traffic, I'm getting a 400 Bad Request.

POST https://digital.garden-fi.com/a/consumer/api/v0/enrollment/lookup

Response (redacted):

{
    "type": "json",
    "messages": [
        "Invalid message body: Could not decode JSON: {\n  \"identifier\" : \"xxxxxxxxx\",\n  \"institutionId\" : \"xxxxxxx\",\n  \"accountNumber\" : \"xxxxxx\",\n  \"phone\" : \"xxxxx\",\n  \"email\" : \"xxxxxx\",\n  \"deviceId\" : \"online-xxxxxx\",\n  \"deviceInfo\" : {\n    \"appVersion\" : \"2.1748.0\",\n    \"os\" : \"Windows\",\n    \"osVersion\" : \"10.0.0\",\n    \"browser\" : \"Microsoft Edge\",\n    \"browserVersion\" : \"120.0.2210.144\",\n    \"browserEngine\" : \"Blink\",\n    \"browserEngineVersion\" : \"120.0.2210.144\"\n  }\n}"
    ]
}