Hi @ivan-magdolen_6846,
An "Invalid credentials specified" basically translates to "invalid username/password". In this case, it doesn't matter that the user has permissions or not (authorization) -- they simply can't login (authentication).
I would try this without chocolatey; you can simply visit the API urls in an "incognito" browser directly, and enter the username/password prompts from the browser. This should be a browser-prompt, and not the ProGet log-in page.
Once you can access the API urls, that will give you an idea of whether the LDAP is workikng or not.
Cheers,
Alana