This is the 4438th most frequent German word.
internen
"Internen" in English means "internal" or "relating to the inside."
Here, 'internen' is an adjective describing 'Angelegenheiten' (affairs), specifying that they pertain to the internal context of the company.
Das Unternehmen führte Untersuchungen zu internen Angelegenheiten durch.
The company conducted investigations regarding internal affairs.
In this case, 'internen' modifies 'Kommunikation' (communication), indicating that it concerns the internal communication mechanisms.
Die internen Kommunikation musste verbessert werden.
The internal communication needed improvement.
'Internen' here describes 'Herausforderungen' (challenges), specifying that these challenges are within the internal structure or operations.