Galaxy APIs 101 Remove Customer Not working

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Galaxy APIs 101 Remove Customer is giving me Bad Request Error:

Details (like screenshots):
HTTP DELETE : galaxy-apis-101.glitch.me/customer/:cust_id

How I found the problem:
I followed the instruction given in the Galaxy API 101 guide.
First I added a customer using HTTP PUT . The request was successful, I verified the same by running the HTTP GET : galaxy-apis-101.glitch.me/customers and I received the following response.
From that i am using the id: N9mo66a-2 thats where i am getting the Bad Request Error

{
  "customers": [
    {
      "id": "NqYeLjFBy",
      "admin": "postman",
      "adminUid": "abc123",
      "name": "Ellen Ripley",
      "address": "8421 Carole Road, Langworthtown, Niue",
      "type": "individual",
      "orders": 2
    },
    {
      "id": "JvdYNfzMIt",
      "admin": "postman",
      "adminUid": "abc123",
      "name": "Thomas Kane",
      "address": "23630 Mitchell Corner, Port Horacio, Italy",
      "type": "individual",
      "orders": 99
    },
    {
      "id": "UQoef2plkO",
      "admin": "postman",
      "adminUid": "abc123",
      "name": "USCSS Nostromo",
      "address": "1896 Nicolas Walk, Mercedesshire, El Salvador",
      "type": "organization",
      "orders": 10
    },
    {
      "id": "N9mo66a-2",
      "admin": "QA@test.com",
      "adminUid": "7b1eeb4d-6189-418b-ad28-08b7392b27be",
      "name": "Saul O'Conner",
      "address": "72794 Mayert Hill",
      "type": "individual",
      "orders": 0
    }
  ]
}

I’ve already tried:l
I tried to debug the issue , but no luck :frowning:

This is sorted. As API started working the next day, when i checked.