Hi Raanah Amjadi, I've just spent a very, very frustrating 4 hours reliving the circular nightmare of trying to sing into Teams. It's really sad to see this has been going on since November 2018. Not a great start to my evaluation of this software. I had two long chat sessions with MS support and one phone call, all of which resulted in no progress. In the end, I found a solution. At some point in the sign-up process, we're asked if we want to use the UK or USA site. Being in the UK, I always selected that option, but every time ended in a cycle of: Download the app, you're not signed up, sign in, download the app, etc..
The solution was to use the USA site. Within seconds I'm in and created my first team. There's something badly wrong with your UK site.
Fingers crossed as I start to use it, that I won't run into any problems due to the wrong country setting..
Perhaps your team could take a look at this.
Best wishes