There are some conficts in using app in B2B here,
Facebook is not secure and there is not enough authentication for B2B. But because of custom in local or market demand, most of facebook users will force companies to keep using fb.
These aspects in market and technology make me have this issue.
A link without login is very appropriate. But there are 2 links in recommendation make users be confused than only one for login. So I wonder how to redirect to other link in 403 to keep first recommend link be only.