Due to understaffing and over tasking the IRS is processing balance due returns LAST after returns with refunds, recalculating returns for mid season tax law changes and return errors, never ending stimulus payments and advance CTC payments. So eventually your successfully filed and paid return will be processed and will show up in your transcripts ... check your account from time to time : https://www.irs.gov/payments/view-your-tax-account
Also even though you had a balance due you can check on the return using the WMR? tool ... enter a zero for refund amount : https://www.irs.gov/refunds
