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Hello @VersionBoy, thanks for joining us, it's a pleasure for me to greet new members! 
Have you tried restarting the password for your account through the Fitbit app? If so, please make sure that the keyboard on iOS is not capitalizing the first letter of it, sometimes this can happens with the keyboard if the Auto-Capitalize setting is enabled.
If after resetting the password you're still unable to access, my best recommendation would be contacting our Support Team. Let them know about the steps you've performed so far, I'm sure they will be more than happy to get you back on track.
I hope this can be helpful, let me know the outcome! 
Best Answer