Permission or URL issue when you use Azure Digital Twin explorer for the 1st time

This article is about permission or URL issue when you use Azure Digital Twin explorer for the 1st time. I had to spend a lot of time trying to fix this issue so hope this helps you

When you open digital twin for the 1^st time, you will have to provide the Azure digital twins URL.

This is the URL from your Digital Twin Overview screen in front of Hostname as shown below, make sure you start with https://

If you get below error or any permission error try below steps to resolve the issue
Error : ‘Double check URL and directory’ or ‘you don’t have permission on the Digital twin URL’
RestError: Sub-domain not found.
    at new t (https://explorer.digitaltwins.azure.net/static/js/465.196a83e5.chunk.js:2:21103219)
    at https://explorer.digitaltwins.azure.net/static/js/465.196a83e5.chunk.js:2:21108505
    at https://explorer.digitaltwins.azure.net/static/js/465.196a83e5.chunk.js:2:21109190

To resolved these errors follow below steps

In the Azure portal, navigate to the Digital Twins resource
Make sure you use the URL given on your Digital Twin Overview screen in front of Hostname as shown above, make sure you start with https://
Also give appropriate permission to yourself by clicking on the Access Control (IAM) menu
Select Add role assignment
Select Azure Digital Twins Data Owner in the Role dropdown listbox
For the Assign access to setting, select User, group, or service principal
Now, select the user that you are using in the Azure portal right now and that you’ll use on your local machine to authenticate with the sample application
Click Save to assign the Role