Does the inability to pronounce the letter "seen" (س) and articulating it as "saad" (ص) affect the validity of the prayer?

The one afflicted with obsessive doubts (waswas) should ignore these doubts and not pay them any attention, because succumbing to them leads to great evil. His obsessive doubt about pronouncing the letter 'seen' does not affect the validity of his prayer. Rather, he should pronounce it correctly and then disregard the whispers of Satan thereafter. If he doubts the Imam's recitation, he should cast aside these obsessive doubts, because the default assumption is the correctness of the Imam's recitation.