Thank you @mesquitebean !
I Called the number [phone number removed]8 for Desktop version). Looks like they haven't extended their hours to daily 7 days/week even for the Tax season or Tax week. I only got virtual assistance who could not help me for this case for sure.
But, guess what? I was able to resolve the issue myself by returning the TurboTax (with the bad license code) back to COSTCO where I bought the TT from. They refunded me after my explanation. And, I immediately bought another one and of course with a new License Code. I tried right away with new license code when I got home. It WORKED! TT was finally activated. I've been using TT for many years. It never happened like this before. I suspect there are two possibilities that caused the problem.
1. TT has a bug or issue that needs to be fixed on their side.
2. The License Code was indeed linked to another account which is not mine. It could be someone else stole the code within the COSTCO itself.
I wanted to share this info so that other people can take immediate action to resolve the issue when they're stuck and No Tech. Support was available. I know how frustrating it is. Hope this thread helps.
