My Galaxy S7 phone came with a 2 year 100GB additional OneDrive storage space offer. However, when I tried to apply it from the OneDrive settings menu, the button did nothing.
A long support call to Samsung didn’t help much either but I did find post from Samsung support in Sweden which provided the solution.
Your phone comes bundled with several Microsoft apps: Excel, PowerPoint, Word, OneDrive and OneNote. If you’ve signed in to your MS account on any of these app besides OneDrive applying the offer will fail! So check them all and select sign out if possible. After this, the option worked as it should and my storage was increased with 100GB.