You need to add a new profile to Edge - Copy the URL of this page https://www.nets-intranets.com/test-user-sign-up and open it in the newly created session
You need to now the name of the user account as well as being able to receive a text message / receive a call on the phone number attached to your account.
You complete this step by using Microsofts password reset page - https://passwordreset.microsoftonline.com/
You need to setup a device for multi factor authentication..
You complete this step by https://aka.ms/mfasetup
You need to add a new profile to Edge and sign in with your account - here you will be asked for your username, password and the for a MFA verification.
You should now able to visit Nets SharePoint Online without any further prompts.
Please report back using this form