Garmin sync stopped Dec 17, 2025 – reauth + backfill failed

Bug Reports
1

Greetings

Garmin → Intervals sync stopped on Dec 17, 2025.
Revoked Intervals in Garmin Connect, reauthorized, and forced re-import starting Dec 1 — no activities backfilled.
Garmin Connect shows full data.
Likely stuck subscription or token on Intervals side.

Thanks, Tamir

2

I have the same problem since early March

3

Garmin heavily restrict historical searches. Re-connecting or even using a different Intervals.icu account doesn’t help. You need to use the “Import All Garmin Data” button in /settings/connections or manually upload the fit files.