The environmental variables has changed according to the documentation. I did a post about it if it may help https://gill.nu/2026/04/10/unraid-tinyauth-v5-migration/ May be some better way to do it but it works.
Any suggestions on how to get TinyAuth v.5 working? It have major changes in configuration files for version 5.x that breaks TinyAuth if updating. Had to go back to 4.1, latest need some modifications.