it seems something has changed since version 2.9.0 that throws the exception whenever you try to initiate the DB from the connection string. previous version all works fine.

at DnsClient.NameServer.ResolveNameServers (System.Boolean skipIPv6SiteLocal, System.Boolean fallbackToGooglePublicDns) [0x0005e] in <93b57b4b99c64a96a2c065ea9ae1fc1f>:0
at DnsClient.LookupClient..ctor () [0x00000] in <93b57b4b99c64a96a2c065ea9ae1fc1f>:0
at MongoDB.Driver.Core.Misc.DnsClientWrapper..ctor () [0x00006] in <69a19ce1f0ff410ca77cc0cfdf31b04c>:0
at MongoDB.Driver.Core.Clusters.DnsMonitorFactory..ctor (MongoDB.Driver.Core.Events.IEventSubscriber eventSubscriber, MongoDB.Driver.Core.Misc.IDnsResolver dnsResolver) [0x00017] in <69a19ce1f0ff410ca77cc0cfdf31b04c>:0
at MongoDB.Driver.Core.Clusters.MultiServerCluster..ctor (MongoDB.Driver.Core.Configuration.ClusterSettings settings, MongoDB.Driver.Core.Servers.IClusterableServerFactory serverFactory, MongoDB.Driver.Core.Events.IEventSubscriber eventSubscriber, MongoDB.Driver.Core.Clusters.IDnsMonitorFactory dnsMonitorFactory) [0x0005d] in <69a19ce1f0ff410ca77cc0cfdf31b04c>:0
at MongoDB.Driver.Core.Clusters.ClusterFactory.CreateMultiServerCluster (MongoDB.Driver.Core.Configuration.ClusterSettings settings) [0x00000] in <69a19ce1f0ff410ca77cc0cfdf31b04c>:0
at MongoDB.Driver.Core.Clusters.ClusterFactory.CreateCluster () [0x000bf] in <69a19ce1f0ff410ca77cc0cfdf31b04c>:0
at MongoDB.Driver.Core.Configuration.ClusterBuilder.BuildCluster () [0x00006] in <69a19ce1f0ff410ca77cc0cfdf31b04c>:0
at MongoDB.Driver.ClusterRegistry.CreateCluster (MongoDB.Driver.ClusterKey clusterKey) [0x000be] in <3b162f88ef324ea39a81e2d6bf362821>:0
at MongoDB.Driver.ClusterRegistry.GetOrCreateCluster (MongoDB.Driver.ClusterKey clusterKey) [0x00021] in <3b162f88ef324ea39a81e2d6bf362821>:0
at MongoDB.Driver.MongoClient..ctor (MongoDB.Driver.MongoClientSettings settings) [0x0002d] in <3b162f88ef324ea39a81e2d6bf362821>:0
at SensoDrive.Client.Infrastructure.Database.CosmoMongoDb.InitializeCosmoDBAsync () [0x0002f]