A dunning letter is not generated because there are no valid transactions to be included

Summary:

We're getting an alert saying:

"A dunning letter is not generated because there are no valid transactions to be included in the dunning letter."

However, I can see the invoices are delinquent in the collections window across several periods.

We've already tried running the following:

a. Refresh Receivables Transactions for Customer Account Summaries

b. Collections Delinquency Management

c. Collections Scoring and Strategy Assignment

d. Update Collections Summary Data

When running the Validate Customer Dunning Report, we also get an error saying Customer/Account is not Delinquent.

Collections Summary Data is Not Refreshed. However, in collections, we can see the invoices are delinquent all the way from 2 days late to 60 days late. We are trying to send notices at the site level and do have emails with a bill to and dunning responsibility.