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Hi @Mare1 and welcome to the Community!
Just as a heads up, I've moved your post from the iOS forum to the Android forum to help keep the Community organized.
First, I'd recommend making sure that you are using the most current version of the Android App. Click here to be redirected to the Google Play Store.
Next, I would recommend rebooting your Android device, double checking that your device is connected to either WiFi or mobile data, and then try logging your weight.
Keep me posted if this helps!
Best Answer