Error when setting endpoints in Provider configuration

[outscale-toa]

Terraform Version

Terraform v1.9.5
on linux_amd64
+ provider registry.terraform.io/outscale/outscale v1.0.0-rc.1

Terraform Configuration Files

terraform {
  required_providers {
    outscale = {
      source  = "outscale/outscale"
      version = "1.0.0-rc.1"                                                                                                                                                                                                                                                                                            
    }
  }
}
provider "outscale" {
....                                                                                                                                                                                                                                                                                    
  endpoints {
    api  = "api.eu-west-2.outscale.com"
    }                                                                                                                                                                                                                                                                                       
}
......

Crash Output

 Error: Value Conversion Error
│ 
│   with provider["registry.terraform.io/outscale/outscale"],
│   on provider.tf line 10, in provider "outscale":
│   10: provider "outscale" {
│ 
│ An unexpected error was encountered trying to convert tftypes.Value into map[string]interface {}. This is always an error in the provider. Please report the following to the provider developer:
│ 
│ cannot reflect tftypes.Set[tftypes.Object["api":tftypes.String]] into a map, must be a map