Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Dear MshawLCB,
Good day!
Thank you for posting to Microsoft Community. We are glad to assist.
As per your mentioned description about "Multiple devices on 365". May I Please know the subscription type are you using? is it Microsoft 365 business/education subscription or Microsoft 365 Home or personal subscription?
Kindly Note that once you have an account (e.g., ******@dgd.onmicrosoft.com), you can access your Microsoft 365 business/education subscription on 15 devices (5 PCs/Macs, 5 Tablets, and 5 Smartphones). It is the same account, so the same logon ID must be used to access the account on all devices. Therefore, if you want to access several devices with the same account yes, it is possible.
If you are using Microsoft 365 Home or personal subscription here it is
For extra reference kindly refer to How sign in works in Microsoft 365 - Microsoft Support
I hope the above information will be helpful. Please feel free to let me know if there are any questions. I will keep assisting you based on the information you provide. We sincerely appreciate your patience and cooperation. Thanks for your precious time. Have a nice day!
Best regards,
Inema | Microsoft Community Moderator