Hello Rohini,
as the mirror deal is created via RFC, you could check if there is any info or error message in SM58... Maybe this already helps to find the reason.
Also: have you tried to create a deal in the target (mirrored) CC - with the same settings as you expect it via mirroring - 'online' in FTR_EDIT? If you find an issue there, it is likely that the same issue blocks the mirroring.
I could also double-check the mirror customizing settings if you list them here
( VTBMDEX, VTBMDMAP -> important: meta-text is unique?, VTBMDINFKT, VTBMDPARTNER).
Best regards,
Marie