MSAL TokenAcquisition GetAccessTokenOnBehalfOfUser always fails because getaccounts is always empty - .net-core

Question

I have been trying to use Azure AD MSAL and ADAL and have NEVER been able to retrieve a token. I have tried the ALL of the samples and keep getting to the same issue, token is created, added to the EF cache DB but when the tokenAcquisition object tries to retrieve it, no account is found and fails to get token.
I have read through most (if not ALL) of the issues on GitHub and SO. this seems to be working for others but looks like numerous people have the same issue and I have yet to see an answer other then pointing me to the samples I have tried.
Simple question for the moment - how do I get accounts from the IConfidentialClientApplication?
I have NEVER been able to get a single account or a list of accounts.
Create app object:
var app = ConfidentialClientApplicationBuilder.CreateWithApplicationOptions(_applicationOptions)
.WithRedirectUri(currentUri)
.WithAuthority(authority)
.Build();
In GetAccessTokenOnBehalfOfUser:
IAccount account = await application.GetAccountAsync(accountIdentifier);
returns NULL
and
var accounts = await application.GetAccountsAsync();
returns an empty lists/IEnumerable.
I would expect to retrieve an account from
application.GetAccountAsync(accountIdentifier)
and a list from
await application.GetAccountsAsync();

Answer 1

OK, Finally found my issue.
The issue comes in using ASPNet identity logging into AzureAD as an external authority but using the identity to signin and create the claims principle.
I was mssing the AzureAD ObjectIdentifier from my claims. so the solution seems to be adding the ObjectIdentifier to the identity. I did this by using a ClaimsTransofrmation and looking for the auth type. If it was NOT Identity.Application it is from AzureAD and check to see if the User has the UserClaim and add it if not. This claim is then picked up and put in the principle's claims and under the covers, now the account is found....
if (principal.HasClaim(c => c.Type == SecurityConstants.ClaimTypes.ObjectId))
{
string oId = principal.FindFirstValue(SecurityConstants.ScpcClaimTypes.ObjectId);
var user = _usrMgr.FindByNameAsync(usrNm).Result;
List<Claim> claims = new List<Claim>(_usrMgr.GetClaimsAsync(user).Result);
if (!claims.Exists(c => c.Type == SecurityConstants.ScpcClaimTypes.ObjectId))
{
_usrMgr.AddClaimAsync(user, new Claim(SecurityConstants.ScpcClaimTypes.ObjectId, oId));
}