Hi @Lacey Sharpe ,
According to your description, you are using SharePoint server, may I know which version it is?
According to the error message, did the tenant administrator make any settings?
Or whether the user's permissions have changed so that access has been blocked.
Please check.
Updated on 12/23
May be the user don't have permission to the word file, please check.
Click Share-->"…"-->Manage access-->Advanced-->Check Permissions
If the user has no permission to the file, assign appropriate permissions to the user.
If the user already has permission, remove and re-grant permissions.
*
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.