Try this.

Press the button. No light? Plug it in and charge it. The battery might be empty.
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Force close the LAAS app. Reopen it and try unlocking again.
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iPhone

Swipe up from the bottom of the screen and pause. Find LAAS, then swipe its preview up and off the screen. Open LAAS again and try unlocking.

Have a Home button? Double-click it to see your open apps.
Apple’s instructions ↗

Android

Open Settings → Apps → See all apps → LAAS. Tap Force stop and confirm. Open LAAS again and try unlocking.

Menu names can vary between Android phones.
Google’s instructions ↗

Illustrated demonstrations.
Check that nothing is blocking the lock, such as a wheel spoke.
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Call LAAS Support: +45 31 33 82 13
Can’t reach us? Keep it moving.
We cover a shared bike, public transport or another reasonable option, up to €30.
If we have local service, we’ll take care of removing the old lock and installing a new one.
If we don’t, we’ll cover up to €30 for removal and installation of the new lock we will send you.
For two years from purchase.
What isn’t covered?
Low battery, phone problems, or anything else unrelated to a failure of your LAAS lock.
How do I claim my expenses?
Contact Support and send us your receipts.
Email your receipts to support@laaslocks.com →