Hi Claire,
Thanks for choosing Microsoft products. It’s my pleasure to assist you.
According to your description, we kindly assume your concern is unable to access the Excel and Word files within the documents folder. In this way, we would like to suggest you:
1.Update to the latest version. We sincerely suggest users update timely to get feature updates, security and non-security. Reference:
Update history for Microsoft 365 Apps (listed by date)
2.Run online repair to check the outcome. Reference: Repair an Office application
If the issue persists, would you mind providing the following information for our troubleshooting?
1.Your Office subscription screenshot via File>Account>Product Information. In order to protect your privacy, please help us mask your PII, such as email address. You could click this icon to upload the image.
2.May we know will this issue also occur in PowerPoint?
3.We noticed that you mentioned [cannot access], we would like to double-confirm that do you mean you click the file but there is no action, or is there any error message? If so, could you please share more information or upload the message screenshot for us?
4.May we know are you able to view files in Word Online or Excel online normally?
Wish you have a good day!
Best Regards,
Sandro