A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Hi Henry,
Based on what you shared, since you have accessed it every day, the most likely causes are a permission change or an expired/replaced sharing link.
Please try opening the original sharing link in an InPrivate or Incognito window, then sign in with the account that was granted access. If you still can't open the file, please contact the file owner to check Manage access and confirm that your account still has permission. The file owner can review or modify access permissions from the file’s sharing settings.
If you need further assistance, please feel free to reach out again in the comments of this post. I'm happy to help.