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Hi Evandro Ropelato,

Welcome to our forum!

Here are some steps you may take:

1. Add and Verify Your Custom Domain

• Go to the Microsoft 365 Admin Center > Navigate to Settings > Domains > Add dominio.com.br as a custom domain > Verify ownership by adding the TXT or MX record to your DNS

1. Set the Correct UPN Suffix (In Azure AD)

• Go to Azure Active Directory > Users > Select each affected user > Click "Edit" next to User Principal Name > Change from @dominiocombr.onmicrosoft.com to @dominio.com.br

1. PowerShell Solution (for bulk changes)

Connect-AzureAD

$users = Get-AzureADUser | Where-Object {$.UserPrincipalName -like "*dominiocombr.onmicrosoft.com"}_

foreach ($user in $users) {

    $newUPN = $user.UserPrincipalName.Replace("dominiocombr.onmicrosoft.com","dominio.com.br")

    Set-AzureADUser -ObjectId $user.ObjectId -UserPrincipalName $newUPN

}

1. Set Primary Domain

• In Microsoft 365 Admin Center > Go to Settings > Domains > Set dominio.com.br as the primary domain

Hope it helps.

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