Accepting an invitation
Access to a client organization's portal is granted by Atlas, by email invitation. Opening the link shows you which organization and email address it's for before anything happens to your account.
Accepting it is one step: choose a password, twelve characters minimum. There's no separate profile setup. Once it's set, you're taken to the ordinary sign-in page with your email already filled in — you sign in fresh from there, which means the normal two-factor step applies immediately, the same as any other sign-in.
Also in Signing in & your account
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