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Connect-SPOService -Url https://tenantch-admin.sharepoint.com -Credential ictcvazuresvc@tenant .ch
Connect-SPOService : The partner returned a bad sign-in name or password error. For more information, see Federation Error-handling Scenarios.
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The account may have MFA enabled. Did you try just using Connect-SPOService -Url https://tenantch-admin.sharepoint.com and typing in the credentials in the prompt?
As AnupamShri said, it is required if the account is using multi-factor authentication: Connect-SPOService -Url https://contoso-admin.sharepoint.com
In addition, if you connect to SharePoint online admin via PowerShell through a proxy server, run following commands and retry Connect-SPOService
$cred = [System.Net.CredentialCache]::DefaultCredentials
[System.Net.WebRequest]::DefaultWebProxy.Credentials = $cred
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@yagobert If Julie's reply helps you, please remember to accept her reply as answer via the "Accept Answer" button, it will be beneficial to others in this forum who meet the same issue in the future. Thanks for your understanding and cooperation.