I found this workaround:
I have 2 lists in SharePoint where List 1 performs a lookup against List 2. In powerapp in the edit form , lookup query is not working in combobox control.
1. Added a textInput control.
2. Changed the default setting to the textInput control added.
For some reason, this works.But I'll admit I would rather not have to have textInput control added.
So if anyone has any solution to my question that would be great.

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