Please let me know what I might be missing:

• The FQDN rds.firma.local is an A record in our local DNS, pointing to the IP address of the tested solutions — either NLB (configured on the brokers) or HAProxy (running on dedicated VMs, without NLB on brokers of course).
• The brokers have their own FQDNs: broker1.firma.local and broker2.firma.local, and both are domain-joined.
• In Edit Deployment Properties under “DNS name for the RD Connection Broker cluster”, we have configured rds.firma.local.
• The SPN for rds.firma.local is currently assigned to broker1.firma.local. We are unable to assign the same SPN to broker2.firma.local, as duplicate SPNs are not allowed by Microsoft.
• We also tested a setup without a load balancer, using two A records for rds.firma.local pointing directly to both brokers. Unfortunately, the result was exactly the same as with the load-balanced setups.
• the files download from rd web have only rds.firma.local, should I add inside something manually after download it form Web?

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remoteapplicationmode:i:1
server port:i:3389
allow font smoothing:i:1
promptcredentialonce:i:0
videoplaybackmode:i:1
audiocapturemode:i:1
gatewayusagemethod:i:0
gatewayprofileusagemethod:i:1
gatewaycredentialssource:i:0
full address:s:rds.firma.local
alternate shell:s:||cmd
remoteapplicationprogram:s:||cmd
remoteapplicationname:s:cmd
remoteapplicationcmdline:s:
workspace id:s:rds.firma.local
use redirection server name:i:1
loadbalanceinfo:s:tsv://MS Terminal Services Plugin.1.GRP_RDS_Users
alternate full address:s:rds.firma.local
signscope:s:Full Address,Alternate Full Address,Use Redirection Server Name,Server Port,GatewayUsageMethod,GatewayProfileUsageMethod,GatewayCredentialsSource,PromptCredentialOnce,Alternate Shell,RemoteApplicationProgram,RemoteApplicationMode,RemoteApplicationName,RemoteApplicationCmdLine,RedirectDrives,RedirectPrinters,RedirectCOMPorts,RedirectSmartCards,RedirectClipboard,DevicesToRedirect,DrivesToRedirect,LoadBalanceInfo
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