Military service question - dual nationality

Hello. I am 29 years old and have dual nationality egyptian and european national. I have been living abroad for almost 12 years now. I still posses the European passport. I obtained an exemption due to having 2nd passport back in 2016. Now approach the age of 30, wondering what is right timing/ the process/advice or steps to prepare/request for the permanent exemption (e3fa nha2y) and is there a chance that they could decline it ?

Thanks in advance.