Configuring External LDAP - I can see users but they can't log in

Question

I am working on a fresh install of WSO2 Identity Server 5.10 with the Ellucian addons.

I have everything almost working, just one thing is keeping me back. I have added my LDAP users and I can list them under Users & Roles -> List -> Users.

When I log in to my test CAS site as the internal admin user, it works fine. What I'm running into is that when I try to log in to my test CAS site as one of my domain users, I get a Login Failed message in my browser and the entries in:

audit.log:

TID: [-1234] [2022-05-09 14:35:02,627] [28898f11-9fa1-4abe-ba42-2082a4799d87]  INFO {AUDIT_LOG} - Initiator : null | Action : Login | Target : ApplicationAuthenticationFramework | Data : { "ContextIdentifier" : "a968d23b-e6c2-4526-9a59-7b4b68a62fc4","ServiceProviderName" : "Test-CASTEST","RequestType" : "cas","RelyingParty" : "Test-CASTEST","StepNo" : "1" } | Result : Failed

and wso2carbon.log

TID: [-1234] [] [2022-05-09 14:35:02,624] [28898f11-9fa1-4abe-ba42-2082a4799d87] DEBUG {org.wso2.carbon.user.core.tenant.TenantIdCache} - TENANT_ID_CACHE which is under TENANT_ID_CACHE_MANAGER, doesn't contain the key : org.wso2.carbon.user.core.tenant.TenantDomainKey@b667606

It doesn't matter whether I login with [email protected] or domain\username or just username. It simply doesn't let me log in.

We aren't doing any multitenancy here.

Any ideas of some things I can check?

Thanks! ~Brant