Option 1: Get permission to open the file
If you can't open a file that you tried to access by email or a link, you might not have permission to open the file.
To request access:
Go back to the "You need permission" page.
Click Request access.
The owner of the file will get an email asking for approval. After they approve your request, you'll get an email.
Contact the owner directly
It may be quicker to send the owner of the file an email or chat message asking them to give you access if you think you shouldn't be seeing this message or you don't receive an email after requesting access.