Get user input with lex bot erroring

I am getting this error after the lex bot fulfils my intent, so it seems like the error is happening on the return to the connect flow:

{
    "Results": "Error",
    "ContactId": "edeb0d45-27b7-4f5e-9353-bf23d47025c5",
    "ContactFlowId": "arn:aws:connect:eu-west-2:742644366029:instance/75ecb247-9348-4ece-a0c1-9c9c94020e1f/contact-flow/dac23507-c82f-4a18-b47d-5d36db263ff5",
    "ContactFlowName": "Voice id",
    "ContactFlowModuleType": "GetUserInput",
    "Timestamp": "2023-06-06T10:52:24.736Z"
}

Connect Flow (the error is happening in the first GetUserInput block):

LexBot intent flow:

The language for the Lex bot and the connect flow is both set to en-GB I can confirm that in the cloudwatch logs. I have double/triple checked the intent name set in the get input block and that's the same as in the Lex bot (doesn't seem there's an issue with it because the right intent is being triggered).