I couldn't join the team that my friend invited me

[Chiaan W]

I received the email from my friend and was invited to join a team on Upwork.
I clicked "Get Started" then it showed that "you must register or log in......", can be seen in the photo.

and I tried over five times, even logged out and logged in my account.

[Bojan S]

Hi Chiaan,

I've checked this for you and you already have accepted the invitation to this team and become part of it. 

[Chan V]

I have this same problem. Help?

[Valeria K]

Hi Chan,

Are you getting any error when trying to accept their invitation?