I think I figured it out by finding this.
It looks like maybe this line in the Github readme file is out of date? Always putting the json file in the www folder within the config folder in HA is what was making it not work. As soon as I moved the json file to the www folder in HA at “root” (not in the config folder), it’s been working fine…
We have used
/config/www/garmin/<something>.jsonon our Home Assistant’s file system. That equates to a URL ofhttps://homeassistant.local/local/garmin/<something>.json.