Is this configuration issue or key issue

Hi F5 was activated with VE-Trial Registration key days ago. But due to some reason, the F5 show unlicensed status after bootup. When I use the same Reg Key to activat the same F5, it shows the below message. I do not know if this is Key issue or registration server issue. the internet is alway good. Any suggestion? Thanks

Hi  @davidy2001  , 
      If this license was working with you before , you may booted up from another bootlocation other than the first used one. 
-at all , try to Activate your license manually not Automatically , maybe you have issue with internet connection with F5. 
Follow the steps on this Video but with manually method : 

or 
Follow this KB : 

Regards

@Mohamed_Ahmed_Kansoh  Right, thanks