Hello there @
coolhandluke
After waiting and waiting with no response here, I search elsewhere and found my answer.
The solution for a working login url link is through the Telegram.
1: Connect to the site channel, and simply just follow last pinned message, then simply follow the cookie crumbs of the following telegram urls till you land on the message about the channel bot ( the bot commands are listed )
2: Connect to the site bot and just follow through (*use google translate to assist for any bot message)
3. Bind your site username with Telegram (first username, then password)
4. After confirmation, you will be able to request the bot to generate your unique login url.
5. Use url to login.