The Public Folder account used for Office 365 must be a member of the PublicFolders and MailEnabledPublicFolders role groups (in Office 365 EAC, Permissions > Admin roles).
A mailbox-enabled service account is required to gather the required mailbox statistics via PowerShell. Migrator Pro for Exchange requires a mailbox-enabled user with Organization Management and Recipient Management permissions for both on-premises and Office 365 mailbox move migrations. This only pertains to Exchange 2010 and above.
Mailbox migration to Office 365 requires either Global Admin, or Billing, Exchange and User Admin roles.
Public Folder migration to Office 365 Groups requires the admin be designated an Office 365 global administrator.
The MAPI account configured within Migrator Pro for Exchange, in Forests | Accounts | Exchange (MAPI), should be using a mailbox that was created in Office 365 and not one that was migrated to Office 365 from on-premises.
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