Invalid Domain Name Used In Username Office 365

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Invalid Domain Name Used In Username Office 365. User Name Required 79 including the at sign in the format namedomain. Display Name required 256.

The Name On The Security Certificate Is Invalid Or Does Not Match The Name Of The Site Error In Outlook In A Dedicated Or Itar Office 365 Environment
The Name On The Security Certificate Is Invalid Or Does Not Match The Name Of The Site Error In Outlook In A Dedicated Or Itar Office 365 Environment from support.microsoft.com

We recommend copy and paste to avoid errors. If you want to use your custom domain for user IDs and email addresses see Verify your domain in Microsoft 365. This behavior occurs because certain special characters arent permitted in user names that you create in the Office 365.

I am using the CSV file with headers only template from microsoft to import multiple users in the migration wizard for Office 365 Exchange Onlinehowever once populated and saved.

The company previously had an Office 365 for professionals or small businesses plan or an Office 365 Small Business plan. DomainName has already been verified for your account or for another Microsoft Online Services account. There will be a rogue in one of the fields thats tripping it up for sure. Save documents spreadsheets and presentations online in OneDrive.