The Fitbit Community is a gathering place for real people who wish to exchange ideas, solutions, tips, techniques, and insight about the Fitbit products and services they love. By joining our Community, you agree to uphold these guidelines, so please take a moment to look them over.
I have found that is I try to use my iPhone 11 to sync my Fitbit 5 I either have to Tuen off my iPad or not be near it. Not sure this is a solution or why it works, but I have had success with this. Hope others find this helpful.