Method 1
To include a link to the SharePoint list item in an email, you can configure it as follows:
In the email body, use the sample expression below to create a link to the list item. This sample expression creates a link to the list item with the text "Open List."
<a href=[[@Web.Url]]/Lists/Obi%20Test%20List/EditForm.aspx?ID=[[ID]]>Open List</a>
You can replace the Obi%20Test%20List with your list name as it appears in your form's URL. The list in this example is called Obi Test List. The "Open List" link should open the Edit form of the item.
Method 2
You might also find it helpful to use the "Link" button within the email body menu, as follows.
Place your cursor in the body where you want the link to go, and click on the Link option in the overflow menu:
In the dialog that pops up, you'll enter the URL (with a dynamic ID) and the text you want to display, something like this:
The following is an example Link. Basically, it's your full List URL, then DispForm.aspx? (or EditForm.aspx? if you want to open the editable form), and then the [[ID]] of the current item.
https://yourcompany.sharepoint.com/sites/YourSite/Lists/TestList/DispForm.aspx?ID=[[ID]]