Thank you @Shay .. your hint did work, the weight was supposed to be in g instead of lb for a charger set to 490 :), thanks again.
Topic summary
Checkout error blocking shipping to valid addresses during Shopify checkout; root causes vary across Shipping and Delivery settings, product configuration, and locations.
Core checks suggested:
- Ensure shipping rates exist for the destination (Settings > Shipping), and all shipping/fulfillment locations are enabled.
- Verify products require shipping, have correct weights/units, and a default package is set.
- Align rates across shipping profiles if multiple profiles are used.
- Test with an address in an active shipping zone; for Local delivery-only, leave zone rates empty to suppress shipping options.
Confirmed fixes by merchants:
- Enabling the shop location in the General Shipping profile.
- Correcting weight units (e.g., g vs lb) and marking “This product requires shipping.”
- Removing or changing the default package that miscalculated rates.
- Matching “Stocked at” warehouse with “Shipping from” and adding rates for that location.
- Including products in the target Market (Settings > Markets).
Profiles guidance:
- Use one profile with multiple destination zones; profiles separate products, not destinations.
Support & status:
- No direct chat link; must contact via Help Center sign-in and search flow.
- Several cases resolved; a few remain open. Screenshots and a YouTube tutorial were shared.