When executing an Azure function through a Scheduled Task we get the following error creating the PlayerPlayStreamFunctionExecutionContext: "Requested value 'GooglePlayGames' was not found.". 
When executing an Azure function through a Scheduled Task we get the following error creating the PlayerPlayStreamFunctionExecutionContext: "Requested value 'GooglePlayGames' was not found.".
It seems your issue related to the version of PlayFabAllSDK you used in your Azure Function. The old version may not define the GooglePlayGames in the enum LoginIdentityProvider. You may use “dotnet add package PlayFabAllSDK” to update the version of PlayFab SDK to latest in your Azure Function.
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