Same issue and being that fitbit has updated their app several times over the past two years I think it is time for a firmware update. Version 5.90 has been around since 2017. Don't alienate us zip users please.
Best AnswerCommon problem at this point 😞
https://community.fitbit.com/t5/Zip/Zip-not-syncing/m-p/3695448/highlight/true#M34684
Best Answer