NPGSQL Exception while performing SSL handshake

I'm using a test self-signed server certificate. Without client certificates. I can't find the cause of the error:

net6.0-android;net6.0-ios;net6.0-maccatalyst net6.0-windows10.0.19041.0

PostgreSQL 14.5, compiled by Visual C++ build 1914, 64-bit

pg_sb.SslMode = Npgsql.SslMode.Require;
pg_sb.TrustServerCertificate = true;
pg_sb.IncludeErrorDetail = true;

Windows Machine net6.0-windows10 Npgsql 6.0.6 SSL handshake - OK

Android net6.0-Android 12 API 31 Npgsql 6.0.6

SSL handshake:

 {Npgsql.NpgsqlException (0x80004005): Exception while performing SSL handshake ---> System.Security.Authentication.AuthenticationException: Authentication failed, see inner exception. ---> Interop+AndroidCrypto+SslException: Exception of type 'Interop+AndroidCrypto+SslException' was thrown. --- End of inner exception stack trace --- at System.Net.Security.SslStream.<ForceAuthenticationAsync>d__175`1 [[System.Net.Security.SyncReadWriteAdapter, System.Net.Security, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].MoveNext() at System.Net.Security.SslStream.AuthenticateAsClient (SslClientAuthenticationOptions sslClientAuthenticationOptions) at System.Net.Security.SslStream.AuthenticateAsClient (String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation) at Npgsql.Internal.NpgsqlConnector.RawOpen(SslMode sslMode, NpgsqlTimeout timeout, Boolean async, CancellationToken cancellationToken, Boolean isFirstAttempt) at Npgsql.Internal.NpgsqlConnector.RawOpen(SslMode sslMode, NpgsqlTimeout timeout, Boolean async, CancellationToken cancellationToken, Boolean isFirstAttempt) at Npgsql.Internal.NpgsqlConnector.<Open>g__OpenCore|191_1 (NpgsqlConnector conn, SslMode sslMode, NpgsqlTimeout timeout, Boolean async, CancellationToken cancellationToken, Boolean isFirstAttempt) at Npgsql.Internal.NpgsqlConnector.Open(NpgsqlTimeout timeout, Boolean async, CancellationToken cancellationToken) at Npgsql.UnpooledConnectorSource.Get(NpgsqlConnection conn, NpgsqlTimeout timeout, Boolean async, CancellationToken cancellationToken) at Npgsql.NpgsqlConnection.<Open>g__OpenAsync|45_0(Boolean async, CancellationToken cancellationToken) at Npgsql.NpgsqlConnection.Open() at pgDynProc.poolcn.connect.Open() in Npgsql.NpgsqlException

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