A lot of customers are complaining about Fitbit Aria 2 WLAN connectivity issues with their fibit aria 2 scale. The former model "fibtit aria" (without the '2') had indeed a few issues. First of of all it only understood the Wifi b standard and passwords and SSID were limited to the characters and numbers.
The new Fitbit Aria 2 promised huge improvements in this area, but I recently ran into a few challenges as well, ending up in the scale not connecting any longer to my WLAN.
First of all it is difficult to find specific solution to reported aria 2 issues, as the Internet is full of former complains of the first Fitbit Aria scale.
Finally I found out that I had changed my router a reset of the Fitbit Aria 2 scale was the only way to fix my issues, but unfortunately the way I tried to do the reset was wrong. It's not enough to hold the rest button (left to the serial number 'SN') in the battery box for a few seconds.
Indeed you have to take out one battery, then you are pushing the reset button and you have to ensure to keep it pressed and re-insert the battery whilst keep holding the reset button for at least 10 seconds.
If you did everything right you will see that your Fitbit Aria 2 WLAN is kind of re-booting, as shown in the picture below.
After this reboot, your Fitbit Aria2 WLAN scale has been reset to the factory defaults and the configuration of a new WLAN environment will again work, without any issues.
To be honest, this is clearly described in the manual, but how many of us are reading manuals, especially a manual for a simple scale. But a sentence or even better a picture, telling us that the customers has to ensure that scale will enter a reboot would have been very helpful.