I've had an extremely similar issue to another post (https://powerusers.microsoft.com/t5/Power-Apps-Portals/Power-Portal-All-pages-gone/m-p/717533#M4271but) but the solution posted didn't work for me (to reset)and Im in need of help. I set up a portal and have been slowly working on it... Today I deleted a page (accidentally duplicated a page I previously made and deactivated - so I reactivated it and deleted that pag) but thought I must have accidentally deleted the whole website as the entire website inside the portal was gone. In my attempts to repair this I decided it would be easier to try to start from scratch so I deleted the current portal and decided to create a new one in the same environment however it is still completely lacking the website section entirely when I add a new website it does not provide any templates whatsoever so I'm at a standstill here. I cannot edit the portal, the edit option is greyed out in app selection page, and when I go into the portal management app, there is no website to edit (active or inactive), no snippets, no templates, no settings. I really need help as I am at a standstill after a month's worth of work that is now not only gone, but I can't get in to even recreate from scratch ( I actually tried creating the new portals twice today, one to create a starter portal in an existing environment in the other one I went in and reset the portal and tried to create new portal from blank... both in existing environment, both times same results). In a perfect world I'd like to reset the day and go back to this morning when I still had all of my original work but I understand there isn't a simple recycle bin that can be utilized. I will happily settle for a 'clean slate starter portal so I can start recreating some of my site, themes, web pages, web roles, access rules, etc. (at least I did take notes since I was learning)! As a final fyi, I did receive a notice both times that the (re) provisioning was complete and both times the link(from email notice and when you click on the portal from Powers Apps page) said something to the effect of something went wrong there's a problem, contact your admin (that's me!) Which was likely due to the fact that the basic website metadata didn't reprovision/reload either time.
Plz help!