@Michael S Thanks for posting in our Q&A.
For this issue, if you want to block Gaming and allow access to Notification, it is suggested to try to create a custom profile to make it. Here is a configuration as an example:
Name: Hide Gaming
Description: Hide Gaming Under Settings App
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/Settings/PageVisibilityList
Data type: String
Value: hide:gaming-gamebar;gaming-gamedvr;gaming-broadcasting;gaming-gamemode;gaming-xboxnetworking
For more details, please refer to the following link:
https://cloudinfra.net/2-ways-to-hide-gaming-under-settings-on-windows-using-intune/
Note: Non-Microsoft link, just for the reference.
Hope it is helpful.
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