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Hi Peter Taylor
Thank you for the detailed testing and screenshot.
Since the same workbook and Microsoft account work correctly in Excel for the web, this does not appear to be an account, workbook, or Stock Data Type service issue. The fact that =FIELDVALUE(A1,"Price") returns #NAME? and some modern functions are not recognized suggests that Excel for Mac may not be loading the modern Microsoft 365 formula library correctly.
As you have already tried reinstalling Office, testing a new macOS user profile, resetting preferences, checking updates, and testing older versions, there may not be much more that can be done from the community forum side.
Please submit this through Excel for Mac > Help > Feedback > I don’t like something, and include the screenshot, Excel version, macOS version, Apple Silicon model, and examples such as =A1.Price and =FIELDVALUE(A1,"Price"). If this is a business Microsoft 365 subscription, your admin can also open a support request from the Microsoft 365 admin center so support can collect logs.
For now, Excel for the web may be the best workaround until Microsoft can investigate the Mac desktop issue further.
You can also have a live chat support session with Microsoft Support to gain some further insight as well
Please note that this is a user-to-user support forum. Moderators and contributors, including external Microsoft employees, are not allowed to directly interfere with Microsoft product features or access back-end systems. Our role is limited solely to providing technical guidance on reported incidents, requests, or ideas.
Thank you for your time and patience