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Live activity says open app to update widget #2456
Description
Describe the bug
Initially the live activity was working, but now it consistently shows no glucose (0.0) at the top dynamic island, and on the lock screen the live activity always shows 'open app to update widget'.
Attach an Issue Report
Loop.Report.2026-07-05.11.06.33+01.00.md
To Reproduce
- Connect a pod and cgm (I am using omnipod and libre 2 plus European)
- Enable notifications and live activity
- When you background the app, observe the live activity says 'open app to update widget' and it doesn't show your glucose
Expected behavior
Live activity updates
Screenshots
Phone
- Hardware: iPhone 17
- OS Version: iOS 26.5.1
Loop Version
- Version Number: 3.14.3 (dev)
- Repo: LoopKit/Loop
CGM
- Device: libre 2 plus european
- Manager app: na
Pump
- Manufacturer: Omnipod
- Model: 5
- Firmware version: NA
Additional context
I have all notifications enabled for the Loop app and live activiti d enabled
Activity
[-]Live activity says open app to update widge[/-][+]Live activity says open app to update widget[/+]Shuengr commentedon Aug 1, 2026
I have seen the same issue on next-dev. It started when I switched to Libre 3 + sensor. Live activities were working with G7 and Omnipod 5 just an hour before the Libre warmup, same pod.
ps2 commentedon Oct 8, 2026
A likely cause and fix are in #2559: with one-minute Libre readings, the Live Activity update grew past ActivityKit's 4 KB limit, so iOS silently dropped every update and the placeholder stayed up. If you can try a build with that PR, please report back here.
Thin Live Activity glucose points so one-minute CGMs fit the size lim…