Why is Argos in Sainsbury's not appearing in my Click & Collect list at checkout?

[cosmosis_collectables]

Does anyone know why Argos in Sainsburys is not appearing in my list of Click & Collect options at checkout? A few weeks ago I bought multiple items from a single seller and each item had its own drop-down Click & Collect list in the checkout. Argos was an option in only one of them! In the Message To Seller box I asked him to send everything to the Argos in Sainsburys address but I think he didn't see it. So one item was sent to Argos whilst the rest came to my home address (fortunately I was at home when the package arrived). Yesterday I bought two items from separate sellers (both over £70 but neither are large or heavy). With the first one Argos in Sainsburys was an option in the Click & Collect list, but not in the second. Yes, there are alternative locations in the list, but Argos in Sainsbury's is by far the most convenient location for me. There seems to be no rhyme nor reason why Argos in Sainsburys is sometimes an option and sometimes not!

[rusticrye]

Sellers cannot ship to an address you supply after you've purchased. They have to ship orders to the address you supplied at checkout.

Not all items are suitable for Click & Collect, not all Argos stores are open yet, not all Sainsbury's stores are allowing Click & Collect  yet, and not all sellers offer Click & Collect.

@cosmosis_collectables 

[cosmosis_collectables]

This doesn't answer my questions. Where I refer to the transaction where I bought multiple items all of the items were paperback or softback books. It was one transaction, but each item had its own Click & Collect list. One book only had Argos in Sainsburys in that list. So the seller HAD received the address of Argos in Sainsburys at the checkout. I was using the Message To Seller option on the checkout page. I was not changing the address after completing checkout!!! None of the books were heavy or oversized. Both of the items I won yesterday are similar to other items I have collected from Argos in Sainsburys and are not large or heavy.
My local Argos in Sainsbury's store has been open throughout the lockdown period and I have used it several times for collecting eBay purchases, whereas the local Royal Mail sorting office has only been open 7am-9am which is very inconvenient.

[tobiasd4]

There have been lots of issues with C&C even before lockdown.
I believe some Sainsbury's have suspended C&C as items were not being collected within the 7 days,
also some collect stores have been refusing ebay items.
We can only report on what we see, best to contact ebay CS to complain, good luck with that.
https://www.ebay.co.uk/help/buying/postage-delivery/changing-delivery-address-method/click-collect?i...