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Hi, Burt Walters
Copilot is supported in Excel for Mac, so this may be a local activation issue rather than an unsupported platform.
Here are some suggestions you can try:
Sign in to Excel for the web with the same account and open a blank workbook. If Copilot appears there, the subscription is working and the problem is limited to the Mac installation.
Check whether Excel is using an older one-time-purchase license instead of the Microsoft 365 subscription. This can happen when Office 2021, 2024, or another license was previously activated on the Mac.
If the wrong license is shown, completely close all Office apps and use the official Office License Removal Tool for Mac. Then reopen Excel and activate it using the Microsoft 365 subscription account. Make sure the account password is available first, because this tool removes all Office licenses from the Mac. Remove Office license files on a Mac
If Copilot works online but remains unavailable after reactivation, reinstall Microsoft 365 directly from the account’s Services & subscriptions page rather than the Mac App Store.
For a work account, ask the Microsoft 365 administrator to confirm that Copilot has been provisioned for the user and is not blocked by an organizational policy.
Thank you for your patience in reading, I hope this information has been helpful to you.
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