Hi @Digital_Admin , Just for the confirmation, what is the data source of the CB_CCEmails control? Is it Office 365 Users? If yes, after deleting the secondary account did you refreshed the data source in app? Also check in you Microsoft Entra ID that the secondary account shows in deleted user section:

Also check for Primary account,

And on last can you confirm whether the user cloud user or On premises user synced to Microsoft Entra ID?
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I hope this helps.
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Thanks,
ANB