Username/password credentials no longer works for public app

Trying to migrate from SDK v4.35 to 5.8. We have a multi-tenant app with consent granted in other tenancies.
Authentication code is
`
var scopes = new[] { "User.Read", "Mail.ReadWrite", "Mail.ReadWrite.Shared", "Mail.Send", "Mail.Send.Shared" };

            var theOptions = new TokenCredentialOptions
            {
                AuthorityHost = AzureAuthorityHosts.AzurePublicCloud
            };

            var userNamePasswordCredential = new UsernamePasswordCredential(theAccount, thePassword, theTenantID, theAppID,theOptions);
           
            graphClient = new GraphServiceClient(userNamePasswordCredential, scopes);`

This no longer works in v5, when trying to access mailfolders giving this error which suggests it does not work multi-tenant

UsernamePasswordCredential authentication failed: AADSTS50020: User account '{EmailHidden}' from identity provider 'https://sts.windows.net/34dc47b4-7068-4e4c-9fd0-df28979f3c6b/' does not exist in tenant 'Arcivate Ltd' and cannot access the application 'a40a20d3-f53a-4c23-8c98-8cee091b51af'(ARCMailImpMSG) in that tenant.

Expected behavior
Token provided

Desktop (please complete the following information):

• OS: Windows 10 (testing) and 2012 server (productio env.)
• Browser N/A
• Version
  Additional context
  Add any other context about the problem here.

Start with the UsernamePasswordCredential setup shown in the issue and compare its behavior between SDK v4.35 and v5.8, paying particular attention to the tenant and application identifiers. Reproduce the mail-folder request with the stated scopes and determine whether the AADSTS50020 error is caused by credential behavior or multi-tenant configuration; done means the token is provided and the request succeeds.