I do not know where to start.
I probably remind you of very basic things we need to do first which is an information you are giving us. There is not enough!!
You need to provide us more information for example:
- screenshot of your connection setting so we can verify potential errors thre
- screenshot of what your connection validation check result is as it will give you most of the information you are missing
use https://help.qlik.com/ to make sure that you meet all requirements - there is a lot you need to learn and a lot of requirements you need to meet so i leave it with you to check that you are meeting all of them: