Hi @sns ,
Please confirm if you have the required module (and also if you need an update), and use:
Install-Module -Name Microsoft.Online.SharePoint.PowerShell
Then execute the following PowerShell commal
Connect-SPOService -url https://domain-admin.sharepoint.com
After you hit Enter, you will see a familiar Office 365 login page.
Finally, enter the Admin name and password
Thanks,
Echo Du
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