Outlook 365 Issue-- unable to send email

‘’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’
Something went wrong with Outlook .
Activity Send Outlook Email ( Send Mail X ) failed:

The path is not of a legal form.
‘’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’

could this be because of Microsoft mobile authentication. as when I open my outlook for the first time it asks for mobile authentication

Hello @raveesh.kumar1!

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Cheers from your friendly
Forum_Staff

Most likely there is a communication problem between Outlook and your outgoing mail server, so the email is stuck in Outbox because Outlook can’t connect to your mail server to send it. check with your email address provider and make sure your mail server settings are up to date.