how to handle 2 different wordpress blog account with same email id

I have my own website based on wordpress : https://www.aliencoders.com/home
and I have account i nwordpress as username: jassics

Now I got invitation from other website admin to join site as an administrator at same email id. I clicked on link and i joined.

Now Whenever, I try to login into that website, it is redirecting me to my own blog i.e. aliencoders.com/home

Its showing that i am logged in into other website but can’t do anything apart from that.
Whenever, i am clicking on
https://bharatithakur.wordpress.com/wp-admin/
It is redirecting it to https://aliencoders.com/home/wp-admin/

Any idea how i can manage other website to write post and all?