1) try to submit product key again + try to activate

2) try to call microsoft for help

3) for deeper analysis use MAS:

Microsoft Activation Scripts (MAS)
- can be found on github: https://github.com/massgravel/Microsoft-Activation-Scripts
- Open-source Windows and Office activator featuring HWID, Ohook, KMS38, and Online KMS activation methods, along with advanced troubleshooting.

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