Fitbit app crashing when I tap on "Start Session"

[Magpye]

Hi. I have an iPhone 11. It is up to dare with latest system upgrade & Fitbit app is updated as well. I took the first 2 months of free premium, signed up to do a 3 week core & glutes strengthening, 3x’s/wk, coached class. When I go to the class & I get to the last second where it says ”start session” I click on “start session” & bam! Fitbit app suddenly closes & I am back @ my iPhone home screen. 

I tried it with other guided programs, too, hoping to ensure it’s not just this particular category. 

help, please! Hope you & your loved ones are healthy & strong😉. Thanks in advance. 
Magpye

Moderator Edit: Clarified subject

[SilviaFitbit]

@Magpye Welcome to the Community. Thanks for getting in touch about this. 

I appreciate all the detailed information shared and the troubleshooting tried prior to posting. I'd like you to log out from the app, force quit it and try again. 

If you're still experiencing this after troubleshooting it, you may want to clear the Fitbit app's cache. 

Hope you're healthy and strong too. I'll be around if you have any additional questions. 😀