With your Garmin connected to your computer, go to “upload activity”. I think if you then go to “device” -> “Garmin” it’ll insist on the Garmin Connect route, which isn’t working for you.
Old school! Its all apps and Bluetooth uploads now BD.
My app updated last night, had to remove the previous Bluetooth connections and set it up again for it to download from the device. Didn’t have any issues auto sending to strava though.
In the past when rides havnt instantly appeared in strava from connect it can take 12-24 hrs before they finally mysteriously appear. If this doesn’t happen then they have probably missed the auto-sync window and you would need to upload them into strava manually (though you could try deleting from Garmin connect and re-uploading from the device, not sure about that though).