Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Susie C!
I am Shakiru, an independent advisor and a user like you, and I am glad to be helping you out today.
Yes with a Microsoft 365 subscription, you can install it on up to 5 devices.
The error code you got has to do with authentication.
Please, ensure you clear your browser cookies and cache.
Did you have any Office installed on your Mac? If yes, you need to completely uninstall the Office and then try to install Microsoft 365 again.
Have you tried to create a new user profile on your Mac and then reinstall Office 365?
Please let me know how it goes and if you need any other assistance and I will be more than happy to help further.
Thank you
Best Regards, Shakiru