Build Error with Umbrella Embedded Static Libraries

We have a custom static library "CMFLibrary" which utilized Firebase pods. The library builds successfully however, embedding CMFLibrary in our test app produces the following build error e.g. ViewController class -> import CMFLibrary (build error: Missing required module 'Firebase'. I have tried different build settings etc per suggestions on SO and other web sites. Same error each time. This is a critical issue. Help would be appreciated. D

Build Error with Umbrella Embedded Static Libraries
 
 
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