Forerunner 55 Connection problem with bluetooth.

Please remove the watch from both the Connect app and Bluetooth settings. Here is a helpful article on how to do this:

https://support.garmin.com/en-US/?faq=8CBmYmJHUr36wvJ6AktXFA 

If you still have an issue you can pair the watch in Express, this is only found on a personal computer and you would plug the watch directly into the computer with the charging cable. Once it is paired in Express you will need to unplug it from the computer and try pairing again with the Connect app. This is the download link for Express if you need it:

https://www.garmin.com/en-US/software/express/windows/