Validate Office 365 Credentials

$problem = $true
while ($problem = $true) {
    try {
        $O365Cred = Get-Credential -message "Please enter your Office365 Admin credentials"
        $O365Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell -Credential $O365Cred -Authentication Basic -AllowRedirection -ea Stop

        Write-Output 'Logon Successful'
        $problem = $false

        Import-PSSession $O365Session -AllowClobber
        Connect-MsolService –Credential $O365Cred
        }

    catch {
        Write-Output 'Your username or password was incorrect, please try again'
    }

}