Wont save my courses i create

I open another Garmin Connect on other TAB and now I can save it

Still a problem in 2023. Unbelievable!

Can you elaborate? I'm not having this issue, so perhaps you're experiencing something slightly different. How are you creating the course? Importing a course from a different source, creating it on Garmin Connect Web, something else?

Yes. I downloaded three Strava segments as GPX, and attempted to create courses for each. Two worked, one didn't. There are no obvious difference between the structures of the three files. I tried the affected route many times, trimmed out unnecessary details, and re-downloaded from Strava. None worked. Garmin Connect takes me through all the steps but at the very end I click Done and it does nothing, just hangs. I waited 30 minutes and still nothing happened. These GPX files all load just fine into other apps such as gpx.studio. I finally got this to work by using AllTrails' Route Converter. The GPX output from AllTrails did work.

Thanks for the info. I was going to try this, but I'm unable to download a Strava segment. I can download a ride/run...

but not just a segment by itself. At any rate I downloaded a GPX and imported successfully into Garmin Connect Web. Could you share on this thread the GPX file that is problematic?

The problematic GPX file is at this link.

Hm, I thought it was saving all right, but in fact there is indeed an error 400 when calling the URL  https://connect.garmin.com/course-service/course during saving the newly imported course.

I was able to save it but with a workaround. I uploaded your GPX to strava as a route, then exported it as a GPX

then successfully imported the GPX file into Garmin Connect as a course.

https://connect.garmin.com/modern/course/176609051

COURSE_176608823.zip

The first character in the file is "<". I determined this with the unix command "head -c 1"

The last character in the file is ">". I determined this with the unix command "tail -c 1"

If you are seeing extraneous characters at the beginning or end you must have have modified the file after downloading from Google Drive.

One salient difference between the original and your re-downloaded copy is fewer digits in the coordinates. The other two files that did work also had fewer digits. 

Is Garmin unable to handle more digits, and fail in a way that is not informative to the user?