SharePoint Online site template GROUP#0 - redirects to another team site - how to turn off?

I have a SharePoint Online site - template GROUP#0

Everytime the URL is visited, it instantly redirects to another SharePoint site

This behaviour is undesired and I am struggling to find any information about how to disable this behaviour

The redirect action appears to make this call:

/_forms/spfxsinglesignon.aspx#access_token=XXXXX

Can anyone advise how I can disable this redirecty?

Thanks!