A lot of times the issue you are experiencing are due to not having WIFI or a strong internet connection. A lot of people don't know this, but you can have a WIFI indicator that looks like this.
Without having a connection to the Internet. The good thing is that this is super easy to test.
Open up your Internet Browser on the device your having issues with.
Open a new tab and then navigate to a brand new website, CNN or your training portal.
Don't just go to Google, you have to navigate to a new site completely.
If you are able to connect to that site and navigate around, you have an internet connection. If you are not able to connect to that site and are not able to navigate around, you don't have an internet connection.