Accessing Hive server with V6 interface not working for me

I am not able to login into the Hive server using he following URL:

and this body:

{ “sessions”:
“Content-Type”: “application/vnd.alertme.zoo-6.1+json”,
“Accept”: “application/vnd.alertme.zoo-6.1+json”,
“X-Omnia-Client”: “Hive Web Dashboard”,
“username”: “myUserName”,
“password”: “myPassword”,
“caller”: “WEB”}]

I get this response:

“error”: {
“reason”: “Not Acceptable”,
“allow”: [

What am I doing wrong?

This is the string that I use:

"Content-Type: application/vnd.alertme.zoo-6.1+json" -H "Accept: application/vnd.alertme.zoo-6.2+json" -H "Content-Type: 'application/*+json'" -H "X-AlertMe-Client: Hive Web Dashboard" -d '{"sessions":[{"username":"'$USERID'", "password":"'$PW'","caller":"openhab"}]}'

Your ‘content type’ is different