When the foreclosure law firm initiates the foreclosure case, they normally include several “fictional parties:, because they often don’t know if borrowers are married, or if there are tenants living in the property who they will evict at the end of the foreclosure case. So they include “unknown spouses” and “unknown tenants”. When the process servers make service, they ask the people they are serving for their names and who they are (are you the homeowner, are you a tenant, etc. ?). Then they attempt (not always correctly), to add up all the pieces to make sure that they have served everyone with an interest. If they conclude that there are no unknown spouses or unknown tenants, they are supposed to move to drop them. Normally that is what is going on, and it is not likely to have any substantive effect on named defendants.
If there is not yet a court order granting summary judgment, I would urge you to do something substantive, other than watching the docket for the auction date. Once summary judgment is granted and an auction date set, it is too late to defend.