Hi @WalkJen here is the article about compatibility of the devices - click to read. Did you see the article on trouble syncing? click to go there.
This is a brand new android phone Samsung galaxy a51 so I'm sure the OS is not the problem. I also have a Flex 2 and charge 3 that I wear for swimming. I prefer my Fitbit One for a more accurate step count.
I all ready looked at troubleshooting article.
Do you have any other suggestions?
Jen
Best AnswerI’ve been having trouble with syncing too. When I first used my One, I synced it with my iPad and it worked for a long time. Now the sync lasts only 6 weeks. It stopped last Sunday and now I’ve reinstalled the app and it can’t find the Fitbit. Two inches away.
I’m resorting to paper and pen.
Best Answer