The main reason of hyperlinks not working in Outlook is the default Internet browser not registered (properly) in your operating system. Typically, this issue comes up after uninstalling Google Chrome or changing the default browser from Internet Explorer to either Chrome or Firefox.
Hyperlinks not working in Outlook? How to make links open again
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– Right-click and select Hyperlink from the menu. – Go to the Insert tab and select Hyperlink. – Press Ctrl + K. Any of those options will bring up the Insert Hyperlink window, where you can enter your desired URL in the Address field.
How to Add Hyperlinks to Outlook Email Messages - BetterCloud
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Most likely problems with opening hyperlinks are connected with either the security restrictions of your Internet browser that doesn't allow opening pop-up windows, or with your Flash player plug-in that prevents you from opening URLs in local Flash files.
My hyperlinks won't open. How do I fix this? - iSpring Solutions
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Ensuring Inserted Links Are Clickable When the window opens with your settings, find the "AutoFormat" tab, check the "Internet and network paths with hyperlinks" box under "Replace," and then click "OK." Moving forward, you should see links you type or paste into future messages as underlined and blue.
How to Change Outlook Security Settings to Allow Clickable Links
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