Can't add newer build to external group for TestFlight

Hi!

I'm trying to add builds to my external group for TestFlight. I can choose a couple of older builds, but not the latest one.

Why is it that I can't add newer builds to the external group in TestFlight? Is there some criteria that isn't met? Have I missed something in App Store Connect or is it something in the binary that needs to be solved/added?

Here is a screenshot from the "Add build" overlay. Latest build is 173 but the latest one that I can choose from is 160 (which is already added and reviewed):

Thankful for any input in this.

PS. I'm the designer and publisher, not that adversed in Xcode and usually spend my time in App Store Connect only.

Can't add newer build to external group for TestFlight
 
 
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