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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.
A login error means the username or password entered in SugarPixel Mini/Classic doesn’t match what Dexcom has on file. The most common causes:

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Phone number username

The + and country code are required — no spaces, dashes, or parentheses. Enter exactly as shown in the Dexcom app. Example: +13334445555

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Dependent account

If the Dexcom app shows a dependent account username, you must use that username — not the caregiver login. The dependent account also has its own password (set when the account was created), not the caregiver’s password.

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Verify your login first

Before re-entering details in SugarPixel Mini/Classic, confirm your login works on the Dexcom website: If you can’t log in there, SugarPixel Mini/Classic won’t be able to connect. Reset your password on the Dexcom site if needed — for dependent accounts, enter the dependent username and the reset email goes to the caregiver’s address. Once you’ve confirmed your login works on the website, tap Clear CGM in SugarPixel Mini/Classic and re-enter your details.