Update - issue was due to live site not being set to use https - they set it to do either https or http and now the links for users work. FYI for futu...

HiWordPress Engine support and I have determined that this behavior is due to their caching protocol. Setting up a staging site without caching the pl...

Sorry for all the posts but I can edit and I forgot to say that WPForo debugger is turned on now if that helps.

I have just tested this with ALL plugins turned off except WPForo and Akismet and theme set to 2016 with no customizations. It still only works while ...