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@SunsetRunner I was able to do a little research within our team and myself. Due to child security, the Ace can only sync with the device that was set up (your iPhone). Therefore, this is why it cannot sync with your Mac computer. I apologize for any inconvenience provided before.
Let me know if you have doubts! 
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Community Moderators ensure that conversations are friendly, factual, and on-topic. We're here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
@SunsetRunner Welcome to our Fitbit Community! I'm sorry to hear about the setup issues that you have experienced with your Fitbit Ace. I want to follow up and would like to know if the issue persists or if your Ace could be connected to your Mac.
Looking forward to your response!
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Community Moderators ensure that conversations are friendly, factual, and on-topic. We're here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
@SunsetRunner Thank you for getting back! I'd like you to make sure that you are following the setup process as described in this help article. If so, let me know the following details in the meantime: Does your Mac have the Fitbit app installed? Does your Mac include Bluetooth system? What is your phone's model? This info will help me to assist you accordingly.
See you later!
Best AnswerHi JuanJo - Here are the answers to you questions - 1) yes the Ace was set up initially to work with my phone and it does connect and replicate with the Fitbit Ace. 2) the Fitbit app is installed on my Mac and does launch. 3) the Mac does have Bluetooth that works - I pair with earbuds and the phone fine 4) I also tried a Fitbit bluetooth USB dongle that I have leftover from my Flex - it does not work with the Ace either. (screenshot attached) 
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Community Moderators ensure that conversations are friendly, factual, and on-topic. We're here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
@SunsetRunner Thank you for providing a screenshot of your Mac. This clarified some details to me. Let me explain this to you: The Bluetooth that is built-in your Mac, is no compatible with Fitbit trackers. Therefore a USB dongle is needed if you want to sync your Ace with your computer. You can find this accessory in our web-store. You can still sync your tracker with your mobile device if you don't want to purchase the USB dongle.
Let me know if you have any questions and I'll be happy to assist!
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Community Moderators ensure that conversations are friendly, factual, and on-topic. We're here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
@SunsetRunner I was able to do a little research within our team and myself. Due to child security, the Ace can only sync with the device that was set up (your iPhone). Therefore, this is why it cannot sync with your Mac computer. I apologize for any inconvenience provided before.
Let me know if you have doubts!
Best Answer
Community Moderators ensure that conversations are friendly, factual, and on-topic. We're here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
@SunsetRunner You are very welcome! I also appreciate your feedback as this helps us to keep improving our products and services.
I'd like to invite you to visit our Discussions board, where you can share your experiences, meet people and create new topics.
Hope to see you in our Fitbit Community more often!
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