Win10 get member version is gray solution

This problem is likely to be caused by the system's privacy settings not meeting the requirements of the preview version of the experience plan, which can be solved by the following settings:
Open system settings - privacy - Feedback and Diagnostics, set the "Send your device data to Microsoft" option to "Complete (recommended)".

Microsoft requires users to participate in a preview version of the plan, the need to send a complete diagnostic and usage data to Microsoft. After upgrading the preview, this option will automatically be set to "Complete" and cannot be changed. As shown below:

Also to remind users that, once you upgrade to the preview version, you can not stop receiving member version. If you want to quit, you need to reinstall the official Win10 system.