SPO site + 404 not found error

Hi guys,

I would request help regarding issue(s) with SPO sites.

I have 3 SPO sites - all with the same problem.

When users who created SPO sites + 3 of admins (which includes me) try to access SPO sites we get the following error "404 not found".

My troubleshooting:

1.) none of the sites are in "Deleted sites" sections;

2.) none of the sites are showing in "Shell Management" with fl* search;

3.) on one of the sites I've added part: "_layouts/15/viewlsts.aspx?view=14" & managed to access the site but the issue is:

• there is nothing to restore from 1st & 2nd RB;
• all the documents are intact (which is good);
• parts such as "Notebook", "Documents", "Pages", "Site Contents" are accessible & when you click on them, no error is showing.
• error is showin only when you access/click on "Home" section.

Any idea what could it be?

Kind regards,