When you get an error "net::ERR_INSECURE_RESPONSE" in Fiori Client, the root cause of it is always an incomplete certificate chain.
You can follow the steps below in the resolution part to check your SSL/TLS 1.2 certificate installation.
SAP Fiori Client for Android
SSL, certificate, Fiori Client, net::ERR_INSECURE_RESPONSE , KBA , MOB-FC , SAP Fiori Client Native Mobile Application , How To
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