No alert for some Text messages

I had this issue so I went through the options that I could locate.

I receive no alert for some Text messages. I have an iPhone SE 2020 software version 15.2.1

Hide Alerts is turned off.

Settings>Notifications Time Sensitive Notifications off.

I’ve powered the phone down then back up several times. Same issue.

I’ve checked for an individual “do not disturb” indication within the message by going to “more” at the bottom of the message, nothing there.

Settings > Notifications > Show Previews > Always

Solution for me, I recently purchased a new Macbook Air. I didn't realize that I was signed into iMessages on my laptop. I logged out of iMessages on my computer. That seemed to take care of my issue. I now get alerts from all messages.

Good Luck

If you have an Apple Watch, your text seem to prioritize to the watch and your phone will not sound on your phone unless you have your phone open. I had your same problem; I turned off notifications on my watch and now my text notifications “ring” on my phone even when it is locked. I THINK you can have either/or but not both…. At least I can’t figure out how to have alerts on both at the same time. Hope this is helpful.

This happened to me with my SE. I spent hours on the phone with both Verizon and Apple support. No solution. I just bought a 13 and it has THE SAME PROBLEM and none of these solves -- I've googled and tried all of them -- work.

Have you checked any of those messages to see if Hide Alerts is turned on? Are your Messages set for Time Sensitive Notifications in Settings>Notifications?

This site helped me a lot!

I currently have this issue too but with an iPhone 11 plus! I’ve been I contact with apple directly and they suggested I reset my phone but the issue isn’t properly fixed!

This is the first thing I did and I toggled them off and back on and the issue didn’t fix itself.