Hello @bsamardzhiev,
It seems that the clustering license is necessary for your machines to work in a cluster. The fact that the license is expiring after two days may suggest that the test licenses you were using previously did not include the clustering feature, or that the clustering license was time-limited.
Since you have already registered the new licenses in the Cisco licensing center and shared them with both machines, you should be able to verify whether the clustering feature is active by checking the configuration settings of your cluster. If the clustering license is not active, you may need to apply the new license to the ESA machines or check if there are any additional licensing requirements for clustering.
Best regards
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