I am currently working with a Web AppBuilder template. I need to make sure that the layers required are added to the Web Map but I cannot figure out where or how to access the Web Map. Should I be adding the layers in some part of the Layer List widget?
Through the portal, I tried clicking on "Map" -> "Add" -> "Add Layer From Web." I have tried to pair my service url with every option in the drop down but I always get an error.
Thank you for any pointers.
They are hosted on my company's local servers. I have tried every option in the dropdown when we hit "Add layer from Web" but none of them would add a layer to them map. If I put the url in the browser, it shows our service so I don't think there is anything wrong with the url. 
Mansi,
Is your local service you are trying to add publicly accessible?
It's not but the map is also not public. The application is not shared with everyone and you have to be in the system and log in with your username and password to access the application.
So if your user that you are logged in with has access to those Map Services then you should not have an issue adding them to the web map. I am not sure why you would have an issue.
Mansi,
To add layers to your web map you need to open the webmap in Portal and use the Add > Add layer from Web. I see that you have tried this and said there was an error. What url are you try to use? Is it a MapServer service from your ArcGIS Server?