Why did my domain disappear after reactivating my online store?

I bought the domain on shopify www.securehaulingdelivery.com. Everything worked fine and the business was running perfectly. We closed the store for about a week. Then when I re activated shopify, all my apps were connected to the www.securehaulingdelivery.com site. All my apps are connected to www.securehaulingdelivery.com.

However, now I have no idea how to connect that site again. All I can connect is securehaulingdelivery.com without the www. When I go to buy the domain, it says that it is unavailable, when I try to transfer the domain, it says the domain cannot be found, and when I try to connect an existing domain, it says that it is already connected to a shopify store.

I need to reconnect www.securehaulingdelivery.com and not securehaulingdelivery.com PLEASE HELP.

I tried connecting www.securehaulingdelivery.com and it gave me some sort of weird error and not that domain is stuck saying “Setup in Progress”