Request Total (from seller when buying multiple items to combine shipping) doesn't work...

[dr.szamoon]

Ebay page says 

We're sorry, but we can't complete your request at the moment.If you see this message more than once, contact us, and we'll do our best to help.

Error code: 80004

I have searched with no success.

Ideas?

[tobiasd4]

Request combined link doesn't always work.

Message seller & request it that way, although most sellers will do this, they don't have to.