API Key error two domains

Hello, we have many domains running where only one API key is used for the map. Unfortunately the key doesn't work for a certain domain and the technicians think it's a Google problem.

Problem: https://www.zwentendorf.at/Vitale_gemeinde/Keltische_Baumkreis 
No problem: https://www.zwentendorf-donau.gv.at/Vitale_gemeinde/Keltische_Baumkreis 

We have already tried two new keys, but they don't work either.

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Is this related to Apigee ?  Where did you get the API keys? Can you provide more context?