Start here: make sure the SugarPixel app is up to date in the App Store or Play Store, and that your SugarPixel Mini/Classic has the latest firmware installed. See Firmware Update.
- Entered your main Libre login instead of LibreLinkUp — these are separate accounts. SugarPixel Mini/Classic uses the email address of the LibreLinkUp follower account, not the main Libre app login.
- Same email on both accounts — if your Libre and LibreLinkUp accounts share an email, create a new LibreLinkUp follower account with a different address. Gmail users can use the + alias trick — e.g. myemail+sugarpixel@gmail.com delivers to the same inbox.
- Special characters in the password — avoid + , ’ ” in your LibreLinkUp password.
- Third-party apps connected to LibreLinkUp — other apps connected to the same account can cause lockouts. Creating a dedicated LibreLinkUp account just for SugarPixel Mini/Classic often resolves this.
- LibreLinkUp app has no readings — if your LibreLinkUp follower app isn’t showing current readings, SugarPixel Mini/Classic won’t either. Resolve the upstream issue first; SugarPixel Mini/Classic will update within 15 minutes once readings appear.
- Recently changed phones, reinstalled the app, or switched CGM apps — you may have logged in with a different account or forgotten to re-add a follower connection. Redo steps 1–2 carefully.