This happened to me as well. It could be that your Splunk Integration User had "Manage Users" removed from it's permissions, which is needed to view the LoginHistory object. Our workaround was to use the User object and LoginEvent to retrieve the same type of data.
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Hi, Check if the daily data limits are exceeded. If you want to bring data from multiple test ids to Splunk (of similar test type, eg. availability test), you can use a single modular input and add all test ids comma separated. I'm not sure if this resolves your issue, but it helped me to resolve data gaps. Good luck.
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