ANSWERED
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Fitbit Update 5/23: This issue is now resolved.
Huge thanks to everyone who endured this calibration notification. Your quick and detailed feedback helped our team to identify and implement a fix. 
If you are still seeing this calibration notification, please the steps I posted here to successfully calibrate your Ionic.
If you are still experiencing this issue after performing the steps detailed above, please feel free to let me know by starting a new topic on the Ionic board.
Fitbit Update 04/25/2018: Thanks again for your continued patience as our team works towards a resolution to this issue.
I appreciate all the feedback we have received in response to this calibration error. This information was very helpful for our team as they identified to root cause of the error.
We hope to have this fix implemented soon and I will be sure to keep you all updated on when this release will start to roll out.
I recognize that this is not an ideal experience, so I truly appreciate you all bearing with us while our team gets this sorted out.
If you have any additional questions, you know where to find me.
Fitbit Update 04/09/2018: Just wanted to thank you all for your continued patience as our engineers work to fix this calibration error message issue.
As mentioned previously, our team is aware of this issue and have proposed a fix which will be rolled out in a future update.
I understand that the calibration message may be annoying to some and I want to assure you that our team is working diligently to have this issue resolved as soon as possible. In the meantime, please continue to ignore the calibration message as this should not affect the functionality of the Ionic.
Special thanks to all who have confirmed whether or not they had performed a factory reset prior to receiving this message.
If you have any additional questions, you know where to find me!
Fitbit Update 03/27/2018: Hi all.
Some users are receiving a persistent notification to calibrate their Ionic after updating to Fitbit OS 2.0.
Our team is aware of this issue and are currently working to have it resolved in a future update. I will be sure to keep you all posted as more information becomes available.
Thanks to all of you who have spent the time to report this issue, as your experiences have been forwarded to our engineering team.
In the meantime, please ignore the calibration message, as it periodically may continue to pop up.
If you have any additional questions, please feel free to reach out. Thanks again all!
Best Answer
Great to hear. Ever since the upgrade my Ionic wont display messages nor update the 'Coach' and I have to log onto my laptap as opposed to using my android app to change my clock face. G
@MattFitbit wrote:Hi all.
Some users are receiving a persistent notification to calibrate their Ionic after updating to Fitbit OS 2.0.
Our team is aware of this issue and are currently working to have it resolved in a future update. I will be sure to keep you all posted as more information becomes available.
Thanks to all of you who have spent the time to report this issue, as your experiences have been forwarded to our engineering team.
In the meantime, please ignore the calibration message, as it periodically may continue to pop up.
If you have any additional questions, please feel free to reach out. Thanks again all!
Best Answer