Slack Webhook

I can’t seem to get the webhook working for Slack. I know nothing about JSON and am having a hard time!

Audit Log Details
Action Details
Email Details
Error:
"Webhook HTTP post request failed with exception The remote server returned an error: (400) Bad Request. "
Properties:
 {
  "EventType": "Change",
  "InvokedBy": "Add",
  "AppTemplateVersion": "1.000057",
  "Process Name": "Handle new HelpMe Tickets record",
  "ServerRegion": "us-east4",
  "TableName": "HelpMe Tickets",
  "OperationUpdateMode": "ADDS_ONLY",
  "EventMatch": "Workflow event successfully matched",
  "IgnoreSecurityFilters": true,
  "Condition": "",
  "MatchesCondition": "True",
  "Exception": "Webhook HTTP post request failed with exception The remote server returned an error: (400) Bad Request. ",
  "Task Type": "Webhook",
  "Task Name": "Send an email",
  "Url": "https://hooks.slack.com/workflows/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",
  "Verb": "Post",
  "MimeType": "application/json",
  "Headers": "",
  "Payload": "{\"Timestamp\":\"11/1/2021 10:00:25 PM\",\"What is your OP number?\":\"21\",\"What aisle are you in or close to?\":\"12\",\"What is your problem?\":\"21\",\"Status\":\"Pending\"}",
  "AppTemplateName": "75417abd-ec93-4a09-8010-27ed3420576c",
  "Operation": "Change Bot",
  "Result": "Failure"
}