Adds a permission for the platform App User Group to access an External Application.
| REQUIRED | KEY | TYPE | DESCRIPTION |
|---|---|---|---|
| Yes | externalApplicationId | str | The ID of the External Application. |
| KEY | TYPE | DESCRIPTION |
|---|---|---|
| success | Boolean | true if the call succeeded, false if there was an error |
| TYPE | WHEN |
|---|---|
| DataNotFoundError | `externalApplicationId` is not found. |