Hi @MICHAEL FRIMPON ,
Welcome to Q&A forum!
According to your description, youe issue seems to be more related to Excel Online, and related issues are not supported in Q&A forum currently. It is recommended that you post a new question in the following forum for more professional support and help.
Microsoft Answers Community
Thanks for your understanding!
users can not see beyond what they are permitted to see
< Personally, it may not be able to achieve currently.
The official stated that "Excel for the web can open workbooks protected by a password but these files cannot be edited in web. Passwords can’t be added, changed, removed, or recovered from Excel for the web".
For more information, please refer to: Protect a workbook
Hope the information could help you.
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