If the shortcut doesn't work, you can try an alternate method to restore your tabs. In Chrome (or any other Chromium browser), click the three-dots icon in the top-right corner and go to History ...
Just Curious: Your everyday questions, answered If you are looking for a more in-depth process breakdown, here is how to restore closed tabs on Google Chrome: Open Google Chrome. Click "History ...
Enable the tab search feature by modifying the shortcut target. This feature is currently available as a flag on Google Chrome Canary – but it will soon be available in the Stable version.