The following error message is returned when a provider is downloaded or updated:
Initializing the backend... Initializing provider plugins... - Checking for available provider plugins on https://releases.hashicorp.com... Error installing provider "tencentcloud": openpgp: signature made by unknown entity. Terraform analyses the configuration and state and automatically downloads plugins for the providers used. However, when attempting to download this plugin an unexpected error occured. This may be caused if for some reason Terraform is unable to reach the plugin repository. The repository may be unreachable if access is blocked by a firewall. If automatic installation is not possible or desirable in your environment, you may alternatively manually install plugins by downloading a suitable distribution package and placing the plugin's executable file in the following directory: terraform.d/plugins/darwin_amd64
The update failed due to a lower Terraform version as illustrated at the official website.
Upgrade Terraform to 0.11.15 or later.