Unable to download metrics using DEXTER

[jitendrarmore]

Describe the bug
Since, DEXTER stated that SAML and LDAP Authentication doesn't support what is an alternative which can be used to download metrics that support OKTA authenticated Account.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://xxxxxx.saas.appdynamics.com/'
2. Click on 'XXXX' and provide a third party username and password for the identity provider
3. post-login unable to download metrics as stated 401 unauthorized
4. See an error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.
Command run : ./AppDynamics.Dexter --job-file /Users/XXXX/Downloads/myjob.json
returned 401 (Unauthorized)

Desktop (please complete the following information):

• OS: [e.g. iOS]
• .NET Framework Type (Full/Core)
• .NET/.NET Core Framework Version

Logs
Add logs from the program execution https://github.com/Appdynamics/AppDynamics.DEXTER/wiki/Log-Files

Reports
Include any produced reports that you have issues with

[danielodievich]

All authentication options are documented here https://github.com/Appdynamics/AppDynamics.DEXTER/wiki/Job-File#username-string - local auth or token auth