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Welcome to the community, @TEK53.
Thanks for the details and just to confirm, may I know what exercise your watch was recording? Your Sense 2 can record 1 floor when you climb about 10 feet or 3 meters. However, if you're using a stationary exercise equipment, such as a treadmill, the floor count won't increase. You can find more information about how your watch records daily activity here.
If after taking these conditions into consideration, the floor count isn't increasing, I'd recommend restarting your watch to refresh its performance.
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