I believe you were following the help center article about '
migrating from AWS to GCP' for the migration process. I am not sure whether you have missed any configuration steps prior to
creating cloud extensions. As mentioned in the '
Setting up Cloud Extensions' documentation, you also need to make sure that your persistent disk quota is high enough to support the Cloud Extensions you'll be adding. As explained there, adding Cloud Extensions will fail if your persistent disk (SSD PD) quotas are discovered to be too low. These requirements are described in
Cloud Extensions Overview
Feel free to use the
support channel of Google Cloud Platform for an additional assistance.