HA with ADFS Farm and ADFSMFA

[Stubing01]

Hello,
First of all, thank you for developing this tool.
I have a question regarding setting up adfsmfa in HA.
I have 2 ADFS servers and I installed adfsmfa on both. I used the default AD base and it turns out that when I test taking the primary server off-server, the secondary does not ask me for MFA authentication and gives me an error message related to authentication. On the other hand, user management is empty on the adfsmfa mmc console on the secondary server. However, on the primary we can clearly see that the second server is well registered. What's the problem? Is it because I didn't use SQL for the database? If so, is it possible to migrate the current data to an SQL database?
Thank you in advance for your feedback.
Error information is below
Détails de l'exception :
Microsoft.IdentityServer.Web.Authentication.External.ExternalAuthenticationException: Le nom d’utilisateur ou le mot de passe est incorrect.

à Neos.IdentityServer.MultiFactor.AuthenticationProvider.IsAvailableForUser(Claim identityClaim, IAuthenticationContext context)
à Microsoft.IdentityServer.Web.Authentication.External.ExternalAuthenticationHandler.ProcessContext(ProtocolContext context, IAuthenticationContext authContext, IAccountStoreUserData userData, IClaimsIdentity identity)
à Microsoft.IdentityServer.Web.Authentication.External.ExternalAuthenticationHandler.Process(ProtocolContext context)
à Microsoft.IdentityServer.Web.Authentication.AuthenticationOptionsHandler.Process(ProtocolContext context)
à Microsoft.IdentityServer.Web.PassiveProtocolListener.OnGetContext(WrappedHttpListenerContext context)**_

[redhook62]

It appears that your service account or other account does not have access to your ADDS forest.
LDAP or LDAPS is required in this case.
Try enabling the "Super User Account" in the security settings.

Error : The username or password is incorrect.

You can switch to SQL mode for High Availability (SQL Server Always On is of course possible). However, all your current MFA users on AD DS will need to re-register on the new system using SQL.

You can optionally script a PowerShell export to the MFA database.

[Stubing01]

Thank you for your response but I think you focused on the error message. However, I do not have this message from the primary server. Authentication + MFA are functional. This message appears only when I take the primary offline and identify myself with a valid account on the secondary server's ADFs and only when the authentication is valid (example: if I have the wrong password, I remain on the authentication page with a normal error message). For me it's because it can't access the information from the adfsmfa tool hence the mmc console blanks on the second server. I checked carefully and the account that manages the ADFs on the primary is indeed the same on the secondary. My question concerns the high availability of the adfsmfa tool. Does it support native AD for this function or am I forced to switch to SQL? Or did I miss something for setting up the adfsmfa component on the second server?

[redhook62]

Yes, when we talk about High Availability (HA).

It's preferable to implement SQL Server in Always On mode, in Synchronous mode.