Thank you for reaching out to us. We are sorry that you haven’t been able to block certain contacts. We are considering bringing this ability to outlook on the mobile browser. However in the meantime you can do this from outlook.com on a desktop or a laptop. Follow the steps mentioned here https://answers.microsoft.com/en-us/outlook_com/forum/all/how-do-i-block-the-email-of-someone-harassing-me/d2d4a775-b8c8-4c38-bcc6-404a940030e8.
An error occurred while saving the commentSemih Seckin commented
How many additional thousands of idea supporters do you expect to beg you to to take action to install the option to block phishing mail senders in mobile outlook application. Please stop procrastination.