I know for the EG915U series, the EG915U-EU variant coverage of the European frequency band.
But what does AC-N05-SNNSA means for EG915UEU-AC-N05-SNNSA?

Where did AC-N05-SNNSA get it from.This is not a hardware issue, it feels like the OC number of the module

I got from soselectronic. Sos electronic shares the part number like this “EG915UEU-AC-N05-SNNSA”, but all the documents for just the part number: EG915U.

Yes, this is the name of an OC, you just need to look at the documentation for EG915U

Thank you so much for your help.