Hi Silver -
I'm Kevin B. Independent Advisor and a Windows user like you. I do apologize for the inconvenience that you're experiencing right now, let me help you sort things out.
It appears that the outlook email app that you're using is not set as you're default email application on your computer. To set the outlook app as you're default email client, please follow the steps below
Press windows key + I
Click on Apps
On the left pane menu, click on Default Apps
Under Choose default apps on the right section, click the "Choose a default" under Email
Select/Click on Outlook to set the application as your default app
Once the Outlook App shows on the list, close the settings
Check if you can send an email using the send to option
Hope this will help and have a bless day!
Thanks.
Kevin B.
Independent advisor