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is it the case of https://github.com/pulumi/pulumi/issues/918 ?

Perhaps it is a case of not fitting the pulumi URN abstraction, but terraform does seem to support importing such a thing

that is a very recent update, could it be that pulumi-aws wasn't updated yet to pull new version in?

We also tried pulling the id from terraform state file, but it just points us to use the original method we tried basically.

warning: A new version of Pulumi is available. To upgrade from version '0.17.28' to '1.0.0-beta.2', run 
   $ brew upgrade pulumi
or visit <https://pulumi.com/docs/reference/install/> for manual instructions and release notes.
Previewing update (peopleticker/qa):

     Type                              Name             Plan       Info
     pulumi:pulumi:Stack               peopleticker-qa             2 errors
 =   └─ aws:ec2:RouteTableAssociation  tf-qa-front-0    import     1 error
 
Diagnostics:
  aws:ec2:RouteTableAssociation (tf-qa-front-0):
    error: Preview failed: importing rtbassoc-a87794d7: Wrong format for import: rtbassoc-a87794d7. Use 'subnet ID/route table ID'

Opened https://github.com/pulumi/pulumi-aws/issues/708. I can repro this as well - and I'm not exactly clear on why it doesn't work (and whether its a Pulumi issue or an upstream provider issue).