EBay has blocked my communication with a buyer?

[tcmmj2]

EBay has blocked my communication with a buyer ??

[**peaseblossom**]

Is it about a collection only item?   If so ebay block messages containing or asking for address or phone number before payment.   The buyer has to pay via ebay first. 

See "Proof of collection" on here:
https://www.ebay.co.uk/help/selling/posting-items/setting-postage-options/local-collection?id=4181