Hi Umang,
"Add Product" like actions are measured by using the ec:addProduct command with a productFieldObject to add product details, and the ec:setAction command to specify the action being performed while we measure transaction action like "Purchase" by using the ec:setAction command and setting the action type to purchase. Transaction level details like total revenue, tax, and shipping are provided in an actionFieldObject.
Also, Please replace the line ga('dtm_ga_standard.require', 'ec') to ga('require', 'ec') and then check whether the data has been sent to Google Analytics reports or not .
If the problem still persists then please check whether the tracker name is set correctly or not in the tool setting of Google Universal Analytics. If you have specified that Google Analytics is already installed on your site's pages, you **must** use the same name here for proper data collection. The default tracker name for Google Analytics is blank. Generally in the legacy implementations we use the following line to create the tracker object.
ga('create', 'UA-XXXXX-Y', 'auto');
Also, Please verify whether the the correct Account Id's have been set in the GA tool settings for Production and Staging account.
Thanks & Regards
Parit Mittal