ECR authentication issue when using cdklocal deploy

Hi - hoping somebody can guide me with this tricky one…

New install of Localstack Pro. Docker login fails through cdklocal deploy

[100%] fail: docker login --username AWS --password-stdin http://localhost.localstack.cloud:4510 exited with error code 1: Error response from daemon: login attempt to http://localhost.localstack.cloud:4510/v2/ failed with status: 403 Forbidden

:x: Building assets failed: Error: Building Assets Failed: Error: Failed to build one or more assets. See the error messages above for more information.
at buildAllStackAssets (/usr/local/lib/node_modules/aws-cdk/lib/index.js:330:116743)
at async CdkToolkit.deploy (/usr/local/lib/node_modules/aws-cdk/lib/index.js:330:142824)
at async exec4 (/usr/local/lib/node_modules/aws-cdk/lib/index.js:385:51795)

Building Assets Failed: Error: Failed to build one or more assets. See the error messages above for more information.