Email is used as the unique username for a user within Coalesce, and the same email address cannot be used for multiple Coalesce accounts. If you need a single email address to access multiple Coalesce accounts, you will need to use plus addressing (also known as subaddressing); for example, firstname.lastname@example.org and email@example.com both route to firstname.lastname@example.org.
See our article on user management for more information.
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