Hello! I understand you’re having trouble logging into the Mibro Fit app and activating your watch. Let’s get this sorted together. To help you better, may I ask a few questions first?

1. Are you able to open the Mibro Fit app on your Windows device at all, or does it fail right when you try to log in?
2. Are you using your email and password to log in, or another method like phone number?
3. Have you already tried pairing the watch via Bluetooth from your PC or phone?
4. Does your watch show any prompts or codes that you need to enter in the app for activation?

Meanwhile, here are some basic steps to try:

1. Make sure your phone or PC has a stable internet connection, as the app needs it to verify your login and activate the device.
2. Ensure your Mibro Fit app is updated to the latest version from the official website or app store.
3. Restart your device and try logging in again.
4. On your watch, go to settings and reset Bluetooth or the connection option.
5. Try to pair the watch by scanning the QR code shown on the watch screen inside the Mibro Fit app, pressing and holding the "Home" button on the watch for 2 seconds to show the QR code.
6. Check the app permissions—make sure it has permission to access Bluetooth and location services, as these are needed to connect the watch.

If these don’t help, please tell me what you’ve already tried and what exactly happens when you try to log in or activate the watch. That way, I can guide you further with more specific fixes.

Looking forward to your reply!