Not sure what you mean by "Rainmeter will not allow Rainlendar2 to run". Rainmeter doesn't kill processes when using Game Mode, it just temporarily unloads the loaded Rainmeter skins when those processes are active:
https://docs.rainmeter.net/manual/user-interface/manage/#GameModeTab
I believe your issue could be this one instead:
https://answers.microsoft.com/en-us/windows/forum/all/why-wont-w11-allow-rainlendar2-app-to-stay-on-the/6acdc7ba-bf80-46df-8b03-a3b52b148ce2
https://docs.rainmeter.net/manual/user-interface/manage/#GameModeTab
I believe your issue could be this one instead:
https://answers.microsoft.com/en-us/windows/forum/all/why-wont-w11-allow-rainlendar2-app-to-stay-on-the/6acdc7ba-bf80-46df-8b03-a3b52b148ce2
Statistics: Posted by Yincognito — 56 minutes ago