In the initial Postman request, I saw that you didn’t use Authentification, but in the HTTP Request activity, you are using it.
Definitely, you are not configuring correctly the HTTP Request activity as in Postman.
Try to put back the SSL verification to True and increase the Timeout to 2 minutes and then decrease gradually its value to match your system network latency.
Did you install the UiPath Studio in Service Mode?
Are you having a proxy in the Studio machine?