Hi there,
What is the correct route You are trying to add?
Is that 172.26.96.1/32 or 172.26.96.0/27 or 172.26.96.128/27 or 172.26.96.192/27?
The route 172.27.96.1/27 is invalid because it has nonzero host portion bits:
172.26.96.0 is the subnet portion, .1 is the host portion.
HTH
Rgds
Alex