I have the same issue. Setting a new sound throws the error posted above. PagerDuty app is 8.11 for me (iOS).

Hi ​@Abhi and ​@justTil,

Thank you for reaching out. The timing of this lines up with when we had an incident where our users were unable to update their notification sounds (see status history). It has since been resolved and everyone should be able to update their sounds without any issue.

Please let me know if it’s already working for you and have a nice day!