Thanks, Jennifer for the reply.
The script tag implemented on all domains is the same, and we are capturing the data in a single report suite. So, the data is not going to a different report suite.y
I have observed a drop in numbers for overall level data too. In addition to that I have had to monitor order details for a day. I have placed multiple orders on UK, AU, and NZ domains. Then I store screenshots for reference and check the order id present in the screenshot in adobe workspace. And found that those details are not present in the adobe workspace. I also check those order IDs with backed data.
If you see the below screenshot, the numbers were captured for some days and the drop was observed from the 3rd of march because the nonmobile devices data is not getting populated.

Also, I compared server calls, the only difference between them is cookie support. and I don't thinks it could be the reason as data is being captured for mobile devices.
UK, AU, & Nz - Cookie support disabled
US, CA - Cookie support enabled
So, I am getting confused if I had not changed my setup. Network hits are passed to adobe as per the console and cloud debugger. Then why the data had stopped populating on the dashboard?