The invitation number or information provided by 1. is incorrect, so the embassy cannot find the relevant records.
The information of the invitation letter has not been processed, and it will take some time for the embassy to inquire.
The information in the invitation has expired or been cancelled.
It is suggested to check whether the information provided is correct, and try to wait for some time before inquiring. If you still can't find the required information, it is recommended to consult the staff of the Russian Embassy for more help.