Troubleshooting – When using MS Office, an “Unlicensed Product” message appears or an activation error is encountered.

Please update your Office product. You can find more details on how to Install Office updates from Microsoft. (The image below is an example of the “new” version of Office. Please select your Office version.)

After the update is complete, click [Activate Product].

Note: If you’re starting to use Office for the first time and haven’t had any updates yet, Office will automatically update within 24 hours after your device connects to the internet. If you would like to download or install Office products, more information can be found at the Microsoft Official Website：Download and install or reinstall Microsoft 365 or Office 2019 on a PC or Mac.

1. You can also refer to the troubleshooting steps for Unlicensed Product and activation errors in Office from Microsoft.
2. If you still encounter problems Please use the tool. “cssemerg97275” from Microsoft. To edit, use the tool after downloading, then select Next to edit. Download link cssemerg97275 : https://microsoftdownload.oss-cn-shanghai.aliyuncs.com/Tools/cssemerg97275.diagcab

Credit : [Microsoft Office] การแก้ไขปัญหา – เมื่อใช้งาน MS Office จะแสดงข้อความ “Unlicensed Product” หรือ พบข้อผิดพลาดในการเปิดใช้งาน | การสนับสนุนอย่างเป็นทางการ | ASUS ประเทศไทย