Permission for Query on Linked Server tables

Hi,

I have 2 servers - Server A and Server B. I have a view that queries tables in Server A. Results are fine.

I create a synonym for tables in Server B. I then use this synonym in my views on Server A. However, now I do not get any results.

If I run queries directly from Server A I do get access.

What permissions do I need to set?

Thanks!