Can't sign in on mobile clients?

Hi!

I have SFB 2019 server with Edge role and reverse proxy. On Windows PC from external network SFB client run successfully. Resources that i published on a reverse proxy is accessible outside of my network. HTTPS cetrificates is trusted.

Checks on site https://testconnectivity.microsoft.com shows no errors except "Additional Details.The Microsoft Connectivity Analyzer can only validate the certificate chain using the Root Certificate Update functionality from Windows Update. Your certificate may not be trusted on Windows if the "Update Root Certificates" feature isn't enabled."

But on mobile devices (both iOS and Android) i get error when try to sign in. Something like this: "You have signed out from system. Enter your credentials to sign in again."

Please help me to solve this problem.

Thanks!