Hi
If you personally still fulfill the criteria for receiving marriage allowance -
Marriage Allowance - ask your wife to fully submit her return, wait between 24-48 hours, then re-run the calculation on your own (this happens automatically before you fully submit your return).
If the marriage allowance is still not present in your calculation after this, contact us by webchat or phone via
Self Assessment: general enquiries, and we can provide further assistance.
Thank you