Hi @NikkiIngram, welcome to our Fitbit Community! I'd like to follow up and help you with your Fitbit Versa Lite since it won't track heart rate. By the way, thank you for troubleshooting this issue before contacting our forums.
Please try the troubleshooting steps that are listed in this help article. This article contains steps that you already tried but you can skip them and proceed with the rest. After this, monitor your watch for the next 24 hours and see if the issue gets fixed.
Keep me posted on the outcome.
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