(note your issue "affected versions" isn't complete - this is version 1.12 but I couldn't pick that)

After launching Minecraft and choosing the "Minecraft Realms" option, I am see the list of available realms (the trial one I signed up for).

I can highlight the line to select it and click the Play button.

I can hover over the Configure Realm button and it changes colour, but it cannot be clicked.When clicking nothing happens.

This is specific to this computer as it works fine on another PC.