fortigate firewall license getting revoke

Hi,

I have a fortigate fws a-p mode managed by fortiManager in air-gap environment, all are in air-gap.

What i see recently i replaced the passive fw with new unit due to rma. after joining it to cluster, both got in-sync as well.

I see the licenses on both a-p are getting revoked, i applied the license file for each unit separately but that does not help. It shows license file succesfully uploaded it will show all IPS, AV in Green with proper expiry date, after 2-5 min it all gets orange with no license.

What i observed is that the license section shows License update ip as Fortimanager, do i need to upload the license via Fortimgr ?

i tried for active fw license file upload under fortimngr Foortiguard settings > service pack > but that also does not help.