Try This First

Before you open a new support ticket check out the following solutions.
Maybe we have already covered your issue here:

1. Can not log in to staging site
2. Error 500 trying to access the staging site
3. Page not found, error 404 after pushing
4. Staging site returns a blank white page
5. Activate permalinks on staging site
6. Staging site redirects back to live site
7. Can not update WordPress on staging site