Organizing and accessing contact information in Outlook on the web for business
Hi PeteRoy,
Greetings.
Thank you for raising your concern in this community.
I have just done some tests and apparently, it is not possible to select multiple contacts at once.
What I can suggest you to do is to create a contact list if you are going to use all contacts at once, or arrange it according to your needs. This way you will not have to add contacts one at a time.
Please understand that some feature don't work the same way on the desktop app and on the web app.
Please take the time to suggest this as a new feature for OWA https://feedbackportal.microsoft.com/
Thank you for your understanding.
Kind regards,
Mac