Unable to reset/activate Iphone X

Hello All,

couple of months ago, I went outside my country(Canada to India) and I used a different sim and when I came back to Canada and used Canadian sim again, my iphone showed a message "No Sim card inserted"

After this, I replaced my sim but the problem remains the same.

I reset my Iphone and erased everything and I locked out of my phone and unable to use it(see attached picture for screen message)

I am pasting the following message below when I brought my phone to my local Apple care store in Guelph, Ontario, CA.

"Hello,

Thank you for visiting us at jump+, your local Apple experts. My name is Alex and I’m the technician that has been working on your device. 

This email is to let you know Service Order 20139675 is ready for pickup. We went through all available troubleshooting steps for this type of issue, but as it turns out, we were not able to resolve it. It seems as though this device may be under activation lock from an employer or potentially locked into a specific carier as I was not able to get a signal when testing a known good SIM card. Please call the store at (519) 265-9225, and if you have any questions or concerns feel free to email me at........."

kindly help me out guys, due to Covid-19 I lost my job and not have enough money to buy a new phone.