@JPas2001 Just to clarify since this is an old thread: you have a situation where you can connect to Emby from outside your network but just not inside the LAN ?
email gets sent to the user as a invite.
User click on the invite
Joins them the server they was invited too.
The can now login using connect login via the app and see the list of servers they have been invited too.
THe issue is the invite link works, but they can not connect through the emby connect list.
Just adding a note, in case you want to search this further. In the upstream forum, there are some examples of using a custom CSS with pageTitleWithDefaultLogo. The CSS can be set in Branding page.
I use the mobile app everyday as well and use port 443 to connect. I put a note in https://docs.cloudron.io/apps/emby/#apps . FWIW, I use the jellyfin app as well with my emby install and that works too. Jellyfin's chromecast feature is a bit buggy, so I cannot use it all the time.
I can run a test instance for you @girish on Azure with NVidia et al using the N series VMs if you like/need a tester. Couple different config options to play with. Just LMK