Error calling Toggl report API

I have been trying to use the Toggl's report API and hit with a problem. Calling a weekly report endpoint by passing the required headers. One of the header is "user_agent", even though this header is added to the request and sent, I keep getting an error "Required parameter 'user_agent' is missing from request. You should specify the name of your application or your email address so we can get in touch with you in case you're doing something wrong." Any idea why this is happening. I have tried the same from postman but result is the same.

Curl output below

Note: Unnecessary use of -X or --request, GET is already inferred.

Trying xx.xxx.xx.xx...
TCP_NODELAY set
Connected to toggl.com (xx.xxx.xx.xx) port xxx (#0)
ALPN, offering h2
ALPN, offering http/1.1
Cipher selection: **
successfully set certificate verify locations:
CAfile: /etc/ssl/cert.pem CApath: none
TLSv1.2 (OUT), TLS handshake, Client hello (1):
TLSv1.2 (IN), TLS handshake, Server hello (2):
TLSv1.2 (IN), TLS handshake, Certificate (11):
TLSv1.2 (IN), TLS handshake, Server key exchange (12):
TLSv1.2 (IN), TLS handshake, Server finished (14):
TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
TLSv1.2 (OUT), TLS change cipher, Client hello (1):
TLSv1.2 (OUT), TLS handshake, Finished (20):
TLSv1.2 (IN), TLS change cipher, Client hello (1):
TLSv1.2 (IN), TLS handshake, Finished (20):
SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
ALPN, server accepted to use h2
Server certificate:
subject: C=EE; postalCode=10143; ST=Harju; L=Tallinn; street=Ravala 8; O=Toggl; OU=PremiumSSL Wildcard; CN=*.toggl.com
start date: Sep 11 00:00:00 2017 GMT
expire date: Oct 25 23:59:59 2018 GMT
subjectAltName: host "toggl.com" matched cert's "toggl.com"
issuer: C=GB; ST=Greater Manchester; L=Salford; O=COMODO CA Limited; CN=COMODO RSA Organization Validation Secure Server CA
SSL certificate verify ok.
Using HTTP2, server supports multi-use
Connection state changed (HTTP/2 confirmed)
Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
Server auth using Basic with user 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
Using Stream ID: 1 (easy handle 0x7f9068805800)

GET /reports/api/v2/weekly/ HTTP/2 Host: toggl.com Authorization: Basic XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX User-Agent: curl/7.54.0 Accept: / user_agent:
Connection state changed (MAX_CONCURRENT_STREAMS updated)! < HTTP/2 400 < server: nginx < date: Fri, 30 Mar 2018 23:03:02 GMT < content-type: application/json < content-length: 379 < access-control-allow-methods: GET, OPTIONS < access-control-allow-headers: Content-Type, Depth, User-Agent, X-File-Size, X-Requested-With, If-Modified-Since, X-File-Name, Cache-Control, Authorization, Accept, Accept-Encoding, Accept-Language, Access-Control-Request-Headers, Access-Control-Request-Method, Connection, Host, Origin, User-Agent < access-control-allow-credentials: true < instance: reports2 < instance: web3 < strict-transport-security: max-age=15552000; includeSubDomains < x-content-type-options: nosniff < x-we-are-hiring: https://jobs.toggl.com/ < x-request-id: 40f722c7c4f1294c9ff9ed92095347d5 < via: 1.1 google < set-cookie: GCLB=CK_CmqX85dijFg; path=/; HttpOnly < alt-svc: clear <
Connection #0 to host toggl.com left intact {"error":{"message":"Required parameter 'user_agent' is missing from request. You should specify the name of your application or your email address so we can get in touch with you in case you're doing something wrong.","tip":"Change your request and try again. Please refer to API documentation at https://github.com/toggl/toggl_api_docs if you need additional help","code":400}}-

toggl / toggl_api_docs

Error calling Toggl report API #305