A.the best option is to remove the edge subscription from -sr15. on -sr17 run the importedgeconfig.ps1 script.
B.the best option is to copy the subscription file from -sr16 and -sr17. on -sr17 run the new-edgesubscription cmdlet.
C.the best option is to set up a new subscription file and import it to -sr16 and -sr17.
D.the best option is to move -sr17 to a separate active directory site.you should also set up a new subscription file on -sr15 and run the new-edgesubscriptio cmdlet on -sr17.