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[@salesforce/b2c-tooling-sdk](../../../modules.md) / [operations/mrt](../index.md) / setPrimaryEnvironmentWithBackend

# Function: setPrimaryEnvironmentWithBackend()

> **setPrimaryEnvironmentWithBackend**(`options`): `Promise`\<[`MrtEnvironmentResult`](../interfaces/MrtEnvironmentResult.md)\>

Defined in: [packages/b2c-tooling-sdk/src/operations/mrt/env.ts:1976](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/8fc17d8708d025c83fb0c44ca73198a200605153/packages/b2c-tooling-sdk/src/operations/mrt/env.ts#L1976)

Sets a storefront's primary environment. SCAPI-only: the legacy MRT Cloud API
has no primary-environment concept, so the legacy branch raises. In `auto` mode
with no SCAPI connection this resolves to legacy and raises the same message.

## Parameters

### options

[`SetPrimaryEnvironmentBackendOptions`](../interfaces/SetPrimaryEnvironmentBackendOptions.md)

## Returns

`Promise`\<[`MrtEnvironmentResult`](../interfaces/MrtEnvironmentResult.md)\>