AD CS - Length of the field exceeds maximum length

Hello,

I have an issue when generating a Certificate in my local AD CS because I have too many SAN. This is mainly for testing purpose but it seems that when my SAN-field exceeds 8192(guesstimate, its around 8000) characters, the AD CS won't generate a Certificate from my CSR. 

So in my scenario, I created a CSR which included a list of 500 SAN. The number of SANs I can have depends on the length of the DNS Names.

My question is, is there a way to increase the maximum field size? 

The exact error message that certreq.exe generates is:

Certificate not issued (Denied) Error Parsing Request  Error 0xc80005e2 (ESE: -1506) The length of the field exceeds the maximum length. 0xc80005e2 (ESE: -1506)

Thanks.