As pointed out by Josep Prat and James Olsen the analysis of the problem was 
incorrect. After sending my original post I realized that the addresses of the 
servers in the bootstrap.servers url were separated by a semicolon, instead of 
a comma. In the example error message, I manually typed the names of dummy 
servers, (correctly) using a comma to separate their values. I have tested 
v3.8.0 with a comma separated value and this works fine. My apologies for the 
inconvenience.

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