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Hi Marce,
Sorry for the inconvenience caused. From your description and screenshots, you found that you cannot access your pervious lists in Microsoft Lists with your business account suddenly, which you keep receiving a 404 error.
Generally, 404 error means the item has been removed or not exist when we try to access this item.
Although you have checked with your members that they didn’t delete this list. However, I suggest you can double check your OneDrive location > Recycle bin and see whether the list is listed there. (If you are the owner of the list and the list is saved to “My list”, the list will be stored in your OneDrive. If you created the list in a SharePoint Team site, you could check the Recycle bin in SharePoint site, since the list will be stored in the associated SharePoint site)
If the OneDrive/SharePoint Recycle bin doesn’t have the list, you can also check the second-stage recycle bin and see whether the list file is located there.
At meantime, may I know the following information at your convenience as the problem could also be related to the account/tenant level?
1: Does this problem occur in all the lists your created or the particular lists?
2: If you created a new list, are you able to access it correctly by you and your members?
3: How about the other colleagues in your organization? Do they have the similar issue with their Microsoft Lists?
Best regards,
Dihao