[Hestia]

I had a similar experience when I first set up an NFC token. At first, there were also problems with synchronization, but then I realized that I needed to manually enter the secret key into the app. If you want to try something easier to set up and more reliable, I can recommend hardware totp token, which supports autonomous operation and NFC. Personally, I have not had any problems with it – everything connects in a couple of minutes.