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This was the second half of the fix that I needed. I filled this box with the address that shows when external connections would authenticate or play, and set “forwardfor” at the proxy, then the information came through. Thank you for this.

Turns out it was as simple as checking a box in my reverse proxy settings to enable “forwardfor” now to wait and see if the information actually gets passed through or if I have to do as NeryK suggests and enter the address in Jellyfin.