What issues may arise if a user account is duplicated during a migration?

When a user account is duplicated during a migration, one significant issue that may arise is the loss of access to previous conversations. This is particularly pertinent because each Slack account is tied to the user's identity, including their message history, file sharing, and interactions within channels.

If there are duplicate accounts created during the migration process, it can lead to confusion about which account retains the user's historical data. The user may find themselves logged into a newly created account that does not contain their past conversations or messages, as those would be associated with the original account. Consequently, this disruption can impact team collaboration and hinder the user's ability to reference important past communications, which is critical in maintaining workflow continuity.

The other choices do not accurately represent typical issues arising from duplicate accounts during migration. Users generally do not receive automatic notifications about duplicated accounts; password resets do not automatically occur due to duplication; and while a user might face challenges in logging in, the essential problem of losing historical data is far more pressing and widespread.