I can't start my trial because the account activation email is not working

Issue symptoms

I did not receive the activation email and it is not in my spam folder.
or

I received the activation email but when I followed the verification link, I was sent the error No user found (invalid activation link).

Resolution steps

When you complete the sign-up for a free trial, you should receive an activation email with a verification link that you click to verify your account and log in for the first time. If you're having trouble receiving that email or following the activation link, follow these steps to re-send a new verification email:

Select your subdomain from the menu below or recall the subdomain you chose when signing up.

Type in the email you used to sign up for the account and press Submit.
Choose subdomain

Read more about this issue in these articles:

How long are account verification emails and password reset emails valid?

How do I reset my password when I can't sign in?