Is it obligatory to complete a missed fast if you wake up to the Adhan of Fajr and have not had suhoor, after having intended to fast on the condition of having suhoor?

The intention for every obligatory fast, including making up for missed Ramadan fasts, must be made the night before (before Fajr), based on the Prophet's (peace and blessings be upon him) saying: "Whoever does not make the intention to fast before Fajr, there is no fast for him." An indecisive intention, such as one conditioned on waking up for suhoor, is not sufficient for an obligatory fast because it indicates hesitation in the intention. Therefore, if you made the intention to fast before the Fajr adhan, your fast is valid. However, after the adhan, making up a missed fast is not valid with an indecisive intention.