These are fellow user supported communities. You should be using Safari 15.6 on your M1 Mac.
Press the shift-key and launch Safari. If you do not have the Developer's menu, visit Safari Preferences > Advanced panel and select Show Develop menu in menu bar. Once you have done that, you can clear your browser cache by pressing option+cmd+E. Also, in Safari Preferences > Security, enable JavaScript. That is crucial to most modern websites functionality.
Additionally, from the Safari application menu, choose Clear History… > [ all history ] and click Clear History.
Now, quit Safari. Launch again normally without the shift key, and see if you can now connect to that website.