Bismillahi r-Rahmani r-Rahim
Certainly, the fasting of Rajab and Sha’ban is Nafilah. But people who have missed days should make them up. Qada’ (making them up) is Fard. And Fard is more valuable than Sunnah.
In prayers, you make intention for Qada’ (to make up) and pray. But fasting is a bit different. If you have missed fasting, you must make its Kaffarah.
The Kaffarah Fasting | Mawlana Shaykh Muhammad Adil ar-Rabbani ق
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Sufi Qalam 
Shukran Alhamdulillah for this piece of very important information
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