My specific problem has been that since upgrading to IOS 17, ALL of my app notification sounds changed to a short, low volume "blip" sound, not just Blink. Today, after trying to change a few settings, all my notification sounds returned, and Blink now sounds like a more substantial "beh-roop" sound (kinda like a thick liquid drop). Not exactly sure what specifically fixed the problem, but here's what I did in case you wanted to try.
I double checked all the usual suspect Notifications and Sounds & Haptics settings to make sure they were set correctly and found nothing wrong. Then in Sounds & Haptics, I changed the ring tones for Text Tone and New Mail, and then set them back to default in order to test the ringtones and hopefully reset them. Then I went into Notifications and into the various individual apps whose notification sounds were not working correctly and changed their tones and then set them all back to default. I think the last app I changed was the Mail (Safari) app's sound under Notification, Customize Notifications, selected my mail provider's account name under Accounts, and noticed my Alerts setting was toggled off and I toggled that back on. Within a few minutes I received both an email and Blink notification that sounded normal. Again, I'm not sure what specifically fixed the problem, but in my case, it seems it may have been resetting the apps whose notifications were sounding distorted and turning on the Mail app's Alert on-off toggle that had been turned off during the IOS 17 install.
Your mileage may vary.... Good luck.
