I am using Rocketchat 2.3.2 which sadly does not have una connect within it.  I could create a custom oauth but have no idea how to fill out most of the fields.....but one thing at a time....I need to be able to open chat.mysite.com and it open mysite.com:3000 or https purposes

Yes, you can use latest Rocket.Chat and use Custom OAuth, steps are the following:

1.

2.

3.

4. Activate 'Merge Users' setting

#tipsandtricks #rocketchat