Avamar : Unable to use my service Tag in the support.

Hey, 

Since this morning i got a new error in Avamar. 

I want to open a case in the Dell support but my service tag is not valid. 

How to get the right one ? 

Can i use another method to join the support ? 

Last time i did open a case with another service tag and then tell the support technician that i need help for Avamar. The technician then asked for the service tag which has worked fine... 

Any tips ? Can Dell help me ? or did anyone here have experienced the same problem ?