Sign in
Sign in at your organisation's own andteam address.
Every organisation has its own address, for example meridian.andteam.com. It is in every invitation, sign-in and notification email andteam sends you. Open it from there, and sign in with your work email or your organisation's single sign-on.
Starting a new job? Use the link in your welcome email: it signs you in with your personal email until your start date.