OP_SESSION environment variable not found

[G3z]

I am unable to perform the migration as OP_SESSION variable is always empty

$ eval $(op signin)
$ secrethub migrate plan ###
Encountered an error: OP_SESSION environment variable not found, run `eval $(op signin)` to set one

cli versions:

$ secrethub -v
secrethub version 0.44.0, build d29a942
$ op -v
2.7.1