Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Ayman,
Based on the error message you mentioned, please check if you have Admin account enabled on your computer.
See the details in the following thread:
Cannot Install Office 365. Error: 30015-11 (3221356598)
Also, if the suggestion above don't work on your side, please try use SaRA tool to uninstall all your Office suite currently installed on your PC.
Microsoft Support and Recovery Assistant
Please let us know if you need any further assistance.
Regards,
Alex Chen