When applying new license files, the tenant expiry is not updated.
To update the expiry showing in the MFA portal in an on-premise instance, you can use this SQL Query executed using SQL Management Studio (SSMS) on the SQL instance used by the MFA server.
Example: UPDATE PartnerSettings SET [Expiration Date] = '01-01-2030'
If you do not need a reminder about the expiry for the tenant, then set the date to a date in the distant future. The server's license will determine the expiry for the system and the license file will get updated periodically, separate from the tenant license value which is not automatically updated when the server license is updated.