How to get the user flow ID from Azure Entra ID?

I am trying to disable sign-up flow from my user flow. Apparently, this need to be done by Graph API as described here.

I am stuck trying to retrieve the user flow ID. I get the following error:

{
  "error": {
    "code": "AADB2C",
    "message": "The application does not have any of the required application permissions (Policy.ReadWrite.AuthenticationFlows, EventListener.Read.All, EventListener.ReadWrite.All, Application.Read.All, Application.ReadWrite.All) to access the resource. "
  }
}

First, I make a request to get an access token.

POST https://{{domain}}.ciamlogin.com/{{tenantId}}/oauth2/v2.0/token HTTP/1.1
Host: login.microsoftonline.com:443
Content-Type: application/x-www-form-urlencoded

client_id={{clientId}}
&scope=https%3A%2F%2Fgraph.microsoft.com%2F.default
&client_secret={{clientSecrect}}
&grant_type=client_credentials

Second, I make a request to get the user flow ID.

GET https://graph.microsoft.com/beta/identity/authenticationEventsFlows HTTP/1.1
Accept: application/json
Authorization: Bearer {{accessToken}}

I get the described permission error above. But I can see that my application has the permission added.

Here are the steps to (1) get the access token, (2) get the user flow id and (3) disable the sign up flow.

### 1. Get Access Token: https://learn.microsoft.com/en-us/entra/identity-platform/v2-oauth2-client-creds-grant-flow#first-case-access-token-request-with-a-shared-secret
POST https://{{domain}}.ciamlogin.com/{{tenantId}}/oauth2/v2.0/token HTTP/1.1
Host: login.microsoftonline.com:443
Content-Type: application/x-www-form-urlencoded

client_id={{clientId}}
&scope=https%3A%2F%2Fgraph.microsoft.com%2F.default
&client_secret={{clientSecrect}}
&grant_type=client_credentials

### 2. Get User Flow ID: https://learn.microsoft.com/en-us/answers/questions/1611622/external-identity-user-flows-disabling-sign-up-in
GET https://graph.microsoft.com/beta/identity/authenticationEventsFlows HTTP/1.1
Accept: application/json
Authorization: Bearer {{accessToken}}

### 3. Disable sign up flow: https://learn.microsoft.com/en-us/answers/questions/1611622/external-identity-user-flows-disabling-sign-up-in
PATCH https://graph.microsoft.com/beta/identity/authenticationEventsFlows/{{userFlowId}} HTTP/1.1
Content-Type: application/json
Accept: application/json
Authorization: Bearer {{accessToken}}

{
    "@odata.type": "#microsoft.graph.externalUsersSelfServiceSignUpEventsFlow",
    "onInteractiveAuthFlowStart": 
    {
        "@odata.type": "#microsoft.graph.onInteractiveAuthFlowStartExternalUsersSelfServiceSignUp",
        "isSignUpAllowed": false
    }
}