❀ Question ❀
If an imam leads the prayer with tayammum due to a valid Sharʿi excuse, is the prayer valid? Also, if the imam recites loudly in a prayer meant to be recited silently—or vice versa—does this require sujūd al-sahw (prostration of forgetfulness)?✔ Leading Prayer with Tayammum
If the imam performs tayammum due to a valid Sharʿi reason and then leads the prayer, his prayer is valid, and therefore the prayer of the followers (muqtadis) is also valid.
✔ Sujūd al-Sahw for Mistakes in Recitation Mode
In loud-recitation prayers (jahriyyah, such as Fajr, Maghrib, ʿIshāʾ):◉ If the imam recites silently instead of loudly, or
◉ In silent-recitation prayers (sirriyyah, such as Ẓuhr, ʿAṣr), if he recites loudly instead of silently,

❀ Reference

❀ Summary ❀
◉ If an imam performs prayer with tayammum due to a valid reason, it is valid for him and the followers.◉ Reciting silently in a loud prayer or loudly in a silent prayer makes sujūd al-sahw obligatory.
◉ These rulings ensure the integrity and correctness of congregational prayer according to the Sunnah.