First try to reinstall the Monimoto App, and restart your phone to see if that helps.
iPhones
If you're on iPhone make sure it's not already paired in your phone's bluetooth settings, and if it is press the little 'i' to forget and unpair your device. Otherwise it can cause issues in the App setup process.
Androids
Try to clean cache and data:
1. Open Settings menu in your phone.
2. Find Monimoto App in the menu, then locate the app.
3. Tap on Storage and clear the data.
If you are still stuck, try this:
Download a free App called NRF Connect, use the bluetooth scanner to find your device (mm.XXXXXXXXXXXX) and connect to it there. After a few seconds it should automatically disconnect itself (if it doesn't disconnect then you can manually do it).
If you have the option to turn on UWB in your settings please turn it ON. If you don't have this option you can ignore it.
Then try the App setup process again.
If you are still having issues please contact support team directly using in-App message, or by email support@monimoto.com