Alarms backup - Days since last full backup


We have a solution in SQL Server Always-On and we make full backup on primary node. Everything looks good but we always have spotlight Alarm "Backup - Days Since last Full Backup" on secondary. I need the acknowledgement because it's a security if we have a failover. How can I define that the backups are on the primary and thus not generate alarms on the secondary node?

For information we are in version

Thank you