Connection to SSRS API via NTLM : handshake rejected

Question

I try to connect to the SSRS REST API via NTLM and cURL, but the authentication fails.

Here is my attempt:

λ curl --ntlm -v -u localhost\osain http://localhost:8080/reports/api/v2.0/CatalogItems                                                                      
Enter host password for user 'localhost\osain':                                                                                                              
*   Trying ::1...                                                                                                                                            
* TCP_NODELAY set                                                                                                                                            
* Connected to localhost (::1) port 8080 (#0)                                                                                                                
* Server auth using NTLM with user 'localhost\osain'                                                                                                         
> GET /reports/api/v2.0/CatalogItems HTTP/1.1                                                                                                                
> Host: localhost:8080                                                                                                                                       
> Authorization: NTLM TlRMTVNTUAABAAAAB4IIogAAAAAAAAAAAAAAAAAAAAAKAPBVAAAADw==                                                                               
> User-Agent: curl/7.55.1                                                                                                                                    
> Accept: */*                                                                                                                                                
>                                                                                                                                                            
< HTTP/1.1 401 Unauthorized                                                                                                                                  
< Content-Length: 0                                                                                                                                          
< Server: Microsoft-HTTPAPI/2.0                                                                                                                              
< WWW-Authenticate: NTLM TlRMTVNTUAACAAAAHgAeADgAAAAFgoqi8RNlChVFdl4AAAAAAAAAAJgAmABWAAAACgDwVQAAAA9EAEUAUwBLAFQATwBQAC0ANQA1AEwATgBMAEoARgACAB4ARABFAFMASwB=
< Date: Wed, 10 Nov 2021 19:15:52 GMT                                                                                                                        
<                                                                                                                                                            
* Connection #0 to host localhost left intact                                                                                                                
* Issue another request to this URL: 'http://localhost:8080/reports/api/v2.0/CatalogItems'                                                                   
* Found bundle for host localhost: 0x1edd3770760 [can pipeline]                                                                                              
* Re-using existing connection! (#0) with host localhost                                                                                                     
* Connected to localhost (::1) port 8080 (#0)                                                                                                                
* Server auth using NTLM with user 'localhost\osain'                                                                                                         
> GET /reports/api/v2.0/CatalogItems HTTP/1.1                                                                                                                
> Host: localhost:8080                                                                                                                                       
> Authorization: NTLM TlRMTVNTUAADAAAAGAAYAJIAAAAcARwBqgAAABIAEgBYAAAACgAKAGoAAAAeAB4AdAAAAAAAAADGAQAABYKIogoA8FUAAAAPBGlQjl35BbQdLJKIbG5wZGwAbwBjAGEAbABoAG=
> User-Agent: curl/7.55.1                                                                                                                                    
> Accept: */*                                                                                                                                                
>                                                                                                                                                            
< HTTP/1.1 401 Unauthorized                                                                                                                                  
< Content-Length: 0                                                                                                                                          
< Server: Microsoft-HTTPAPI/2.0                                                                                                                              
* NTLM handshake rejected                                                                                                                                    
* Authentication problem. Ignoring this.                                                                                                                     
< WWW-Authenticate: NTLM                                                                                                                                     
< Date: Wed, 10 Nov 2021 19:15:52 GMT                                                                                                                        
<                                                                                                                                                            
* Connection #0 to host localhost left intact        

The login/password are windows credentials. If I enter this URI in a browser: http://localhost:8080/reports/api/v2.0/CatalogItems , I get a valid answer. But I can't use this as I would like to play with the SSRS API, and I can't do this with a browser(I need to make GET and POST requests, with parameters and so on).

Here is my SSRS security settings in SQL Server Management Studio (SSMS):

Thank you