Type this on the device. Karoo: PaceKeeper → Pair. Fenix:open PaceKeeper, hold UP → PAIR. Six taps either way.
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The Karoo polls every ten minutes while idle and at ride start; the Fenix pulls when you open PaceKeeper. Both offer SYNC NOW.
Two requests, cached locally so a dead zone cannot lose them; then the device reports back what it is holding — the HOLDING line above.
No plan, no signal, expired token — it rides with the defaults instead of blanking, and stamps pk_fallback.
Pushed back on the next connection and reconciled against the stash, deduped on the intake uid pair.