question #1 Sahih Muslim 1146a, Book 13, Hadith 193 : What are the permissible reasons for delaying the completion of missed Ramadan fasts?

I heard ‘A’isha (Allah be pleased with her) as saying: I had to complete some of the fasts of Ramadan, but I could not do it but during the month of Sha’ban due to my duties to the Messenger of Allah (ﷺ) or with the Messenger of Allah (ﷺ).