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Try a restart. If the Ionic is still undercounting steps, go to the Fitbit app, open Advanced Settings, and select Stride Length. Adjust it if the stride length is inaccurate.
“Just keep swimming,Just keep swimming, swimming, swimming”- Dory If you find my answers helpful, Vote for them and accept them as the Solution! Ionic | Charge 2 | iPad 2017 running iOS 12.1.2 Beta