Overview: Validation can be handled in a multitude of ways in Power Apps, this technique I used for a fairly advanced set of Validation Requirements.
Basic Validation Example
To check that at least 1 of these two textInput box has been filled in. Add this function to the DisplayMode:
If((IsBlank(srchMemberAccNo.Text)) && (IsBlank(srchMemberEmail.Text)), DisplayMode.Disabled, DisplayMode.Edit)
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