The final nūn in مُسْلِمُونَ belongs to the plural ending and drops in iḍāfah.
مُسْلِمُو الْمَدِينَةِ — the Muslims of the city: nūn drops but the wāw stays.
مُسْلِمِيَّ — my Muslim men: attachment to first-person yāʾ changes wāw to yāʾ and produces idghām.
Nūn deletion occurs in both; the additional wāw change is specific to attachment to yāʾ.
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Iḍāfah to Yāʾ al-Mutakallim and the Six Nouns
The final nūn in مُسْلِمُونَ belongs to the plural ending and drops in iḍāfah.
مُسْلِمُو الْمَدِينَةِ — the Muslims of the city: nūn drops but the wāw stays.
مُسْلِمِيَّ — my Muslim men: attachment to first-person yāʾ changes wāw to yāʾ and produces idghām.
Nūn deletion occurs in both; the additional wāw change is specific to attachment to yāʾ.