serverless-domain-manager: ConfigError: Missing region in config

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Bug Report

We have a deployment that relies on serverless-domain-manager which has worked happily for 2 years and then suddenly stopped. It is run locally and remotely on BitBucket Pipelines, which is where we see the failure. Has something changed about the handling of regions? Needless-to-say the region is defined in the serverless configuration.

provider:
  name: aws
  runtime: nodejs12.x
  region: eu-west-2
  tracing: true

>> serverless create_domain -s staging
 
  Error --------------------------------------------------
 
  Error: Error: 'www.mysite.world' was not created in API Gateway.
  ConfigError: Missing region in config
      at createDomainName.catch (/opt/atlassian/pipelines/agent/build/node_modules/serverless-domain-manager/index.js:108:15)
      at <anonymous>
      at process._tickDomainCallback (internal/process/next_tick.js:229:7)
 
     For debugging logs, run again after setting the "SLS_DEBUG=*" environment variable.
 
  Get Support --------------------------------------------
     Docs:          docs.serverless.com
     Bugs:          github.com/serverless/serverless/issues
     Issues:        forum.serverless.com
 
  Your Environment Information ---------------------------
     Operating System:          linux
     Node Version:              8.17.0
     Framework Version:         1.61.2
     Plugin Version:            3.2.7
     SDK Version:               2.2.1
     Components Core Version:   1.1.2
     Components CLI Version:    1.4.0