A warm welcome to the Community @EddieGee. Thanks for the details that you've mentioned. I would like you to double check that you're using the same email address that you're in your online Dashboard as this may be why it's showing you "incorrect username or password".
After this, confirm you have the latest app version for Android 2.66. Sometimes the app may show you Fitbit.com is down for maintenance but you just need to try a while after and this should work.
Last but not least, you may want to follow the procedure posted here to connect your Samsung S8+ handset to your Ionic How do I connect Bluetooth audio devices to my Fitbit watch?.
Hope this helps! Keep me posted.
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