I have been using Pi-hole on a dedicated SBC (Orange Pi Board) for nearly 3 years now. I have it setup protecting my entire home network, complete with DNS enabled etc. It has proven to be quite reliable to date. My issue now though is that last week (around 5th October 2020) I did an update and reboot. Since then I have been completely unable to view the Pi-Hole webpages. I can still SSH into the system just fine, and it is running, however I just get a 404 error if I try to send a webpage request in the same manner I have done for years now. IE https://pi.hole/admin or my.ip.address/admin simply result in a page not found error.
I have looked online, but can find no assistance on this, apart from a very old Reddit discussion about this, that is years old. None of the suggestions there were relevant to my build.
I have followed the instructions in your template, which suggest the creation of a debug token. This I have done, and it is:
Any assistance would be appreciated, thank you.