Azure ad b2c azure B2C继承错误

我在Azure B2C中创建了一个策略，下载了它并进行了一些定制。当我试图上传它时，我得到了这些我不理解的继承错误。即使我没有做任何更改，只是尝试上载刚下载的策略，我也会收到相同的错误。这个错误指的是什么？为什么不使用上载的策略覆盖策略

Unable to upload policy. Reason : Validation failed: 1 validation error(s) found in policy "B2C_1A_B2C_1_SIGNIN" of tenant "m60b2c.onmicrosoft.com".Policy 'B2C_1A_B2C_1_Signin' of tenant 'm60b2c.onmicrosoft.com' is not allowed to inherit from the specified base policy. Inheritance chain: {
 "TenantId": "m60b2c.onmicrosoft.com",
 "PolicyId": "B2C_1_Signin",
 "TenantObjectId": "fb3c2543-8e76-443a-bf5d-4f14f78dbb9b",
 "Root": true,
 "Derived": {
 "TenantId": "m60b2c.onmicrosoft.com",
 "PolicyId": "B2C_1A_B2C_1_Signin",
 "TenantObjectId": "fb3c2543-8e76-443a-bf5d-4f14f78dbb9b",
 "Rule": "All",
 "InheritanceAllowed": false,
 "Reason": "Policy 'B2C_1A_B2C_1_Signin' in tenant 'fb3c2543-8e76-443a-bf5d-4f14f78dbb9b' is blocked from inheriting policies from 'b6291105-4814-4453-831c-7aba93c480b2' as the basic policy constraint handler 'B2CBasicPoliciesOnly' cannot match the policy id to a prefix or registered policy id."
 }
 }

您只能使用Azure AD B2C门户编辑内置策略

不支持下载、修改然后上载内置策略

---

如果要自定义登录流，则必须使用。

任何示例说明如何完成？已尝试但无法找到正确的解决方案。您好@IsaiyavanBabuKaran您指的是关于如何编辑内置策略的说明吗？