How to trigger custom alert with source condition

[PotatoDataUser]

I have a index with 7 sources of which I utilize 4 sources.

The alert outputs data to a lookup file as its alert function and is written something like this.

index=my_index  source=source1 OR source=source2 OR source=source3 OR source=source4
stats commands
eval commands
table commands etc.

I want to configure the alert to run only when all the four sources are present.
I tried doing this.

But the alert isnt running even when all 4 sources are present.

Please help me on how to configure this.

[ITWhisperer]

Is your search wide enough to cover events from all four sources? Does the alert trigger if you reduce it to 3?

[PotatoDataUser]

Yes the search covers all 4 sources, when I run the search manually and check the events I see all the 4 sources present.