Hi there @CassieHickman, Welcome aboard to our Community and I'm sorry to hear you are having issues to sync your tracker. @SunsetRunner has provided you a great article to address this type of issues. From my side I recommend to check this suggestions too that might be of your help: Syncing troubleshoot for iOS devices.
If the issue persist I strongly suggest to contact our Support Team for additional help. Just let them know the steps you have taken to resolved this issue. I'm confident they will let you know what would be the next step.
See you around and come back if you need more help.
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