I have this problem on my IPad. It’s a definite glitch in the program as many people are reporting the same issue. Maybe a fix with 15.2?

Same on my IPad. No sound notifications! Checked all the settings, hard restart. Nothing! Hopefully 15.2 will fix this!

Same here, both iPad and iPhone since 15.1 update. Tried all the usual, power off power on, checked all the settings 🤔