azure-active-directory-b2c
Expert knowledge for Azure Active Directory B2C development including troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when building B2C user flows/custom policies, configur
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SKILL.md
Azure Active Directory B2C Skill
This skill provides expert guidance for Azure Active Directory B2C. Covers troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. It combines local quick-reference content with remote documentation fetching capabilities.
How to Use This Skill
IMPORTANT for Agent: Use the Category Index below to locate relevant sections. For categories with line ranges (e.g.,
L35-L120), useread_filewith the specified lines. For categories with file links (e.g.,[security.md](security.md)), useread_fileon the linked reference file
IMPORTANT for Agent: If
metadata.generated_atis more than 3 months old, suggest the user pull the latest version from the repository. Ifmcp_microsoftdocstools are not available, suggest the user install it: Installation Guide
This skill requires network access to fetch documentation content:
- Preferred: Use
mcp_microsoftdocs:microsoft_docs_fetchwith query stringfrom=learn-agent-skill. Returns Markdown. - Fallback: Use
fetch_webpagewith query stringfrom=learn-agent-skill&accept=text/markdown. Returns Markdown.
Category Index
| Category | Lines | Description |
|---|---|---|
| Troubleshooting | L37-L43 | Diagnosing and fixing Azure AD B2C errors, debugging custom policies and user flows, and using Application Insights to trace and troubleshoot policy execution. |
| Best Practices | L44-L52 | Best practices for configuring Azure AD B2C, designing user flows/custom policies, securing MFA and architecture, and detecting/mitigating credential and account attacks. |
| Decision Making | L53-L60 | Guidance on planning Azure AD B2C usage: choosing app types, understanding MAU billing, regions/data residency, retirement impact, and selecting a user migration strategy. |
| Architecture & Design Patterns | L61-L69 | Global Azure AD B2C customer identity architectures, comparing funnel- vs region-based designs, and step-by-step proof-of-concept implementations for each pattern |
| Limits & Quotas | L70-L77 | Service limits, quotas, and restrictions for Azure AD B2C tenants, including directory size, token formats/constraints, and tenant creation and scaling limits. |
| Security | L78-L94 | Security hardening for Azure AD B2C: MFA, Conditional Access, Identity Protection, CAPTCHA, TLS/ciphers, policy keys, admin/tenant access control, API security, and Sentinel-based monitoring. |
| Configuration | L95-L209 | Configuring Azure AD B2C: custom policies, user flows, tokens, MFA, identity providers, claims/transformations, app/API registration, UI/localization, SSO, security, and advanced auth options. |
| Integrations & Coding Patterns | L210-L322 | Patterns and step-by-step guides for integrating Azure AD B2C into apps, securing APIs, configuring IdPs/social logins, custom policies, fraud/risk tools, and routing logs/monitoring. |
| Deployment | L323-L327 | Automating deployment of Azure AD B2C custom policies using CI/CD pipelines, including setup steps, YAML examples, and best practices for Azure Pipelines and GitHub Actions. |
Troubleshooting
| Topic | URL |
|---|---|
| Azure AD B2C error codes and troubleshooting reference | https://learn.microsoft.com/en-us/azure/active-directory-b2c/error-codes |
| Troubleshoot Azure AD B2C custom policies and user flows | https://learn.microsoft.com/en-us/azure/active-directory-b2c/troubleshoot |
| Troubleshoot Azure AD B2C custom policies with Application Insights | https://learn.microsoft.com/en-us/azure/active-directory-b2c/troubleshoot-with-application-insights |
Best Practices
| Topic | URL |
|---|---|
| Apply Azure AD B2C integration and configuration best practices | https://learn.microsoft.com/en-us/azure/active-directory-b2c/best-practices |
| Developer guidance for Azure AD B2C user flows and custom policies | https://learn.microsoft.com/en-us/azure/active-directory-b2c/custom-policy-developer-notes |
| Secure phone-based MFA in Azure AD B2C using monitoring and alerts | https://learn.microsoft.com/en-us/azure/active-directory-b2c/phone-based-mfa |
| Apply security best practices to Azure AD B2C architecture | https://learn.microsoft.com/en-us/azure/active-directory-b2c/security-architecture |
| Mitigate credential attacks in Azure AD B2C | https://learn.microsoft.com/en-us/azure/active-directory-b2c/threat-management |
Decision Making
| Topic | URL |
|---|---|
| Choose appropriate application types for Azure AD B2C | https://learn.microsoft.com/en-us/azure/active-directory-b2c/application-types |
| Understand Azure AD B2C MAU billing and tier selection | https://learn.microsoft.com/en-us/azure/active-directory-b2c/billing |
| Plan Azure AD B2C region availability and data residency | https://learn.microsoft.com/en-us/azure/active-directory-b2c/data-residency |
| Choose a user migration approach to Azure AD B2C | https://learn.microsoft.com/en-us/azure/active-directory-b2c/user-migration |
Architecture & Design Patterns
| Topic | URL |
|---|---|
| Apply funnel-based global identity design with Azure AD B2C | https://learn.microsoft.com/en-us/azure/active-directory-b2c/b2c-global-identity-funnel-based-design |
| Implement funnel-based global identity proof of concept in Azure AD B2C | https://learn.microsoft.com/en-us/azure/active-directory-b2c/b2c-global-identity-proof-of-concept-funnel |
| Implement region-based global identity proof of concept in Azure AD B2C | https://learn.microsoft.com/en-us/azure/active-directory-b2c/b2c-global-identity-proof-of-concept-regional |
| Apply region-based global identity design with Azure AD B2C | https://learn.microsoft.com/en-us/azure/active-directory-b2c/b2c-global-identity-region-based-design |
| Design a global customer identity solution with Azure AD B2C | https://learn.microsoft.com/en-us/azure/active-directory-b2c/b2c-global-identity-solutions |
Limits & Quotas
| Topic | URL |
|---|---|
| Review Azure AD B2C service limits and restrictions | https://learn.microsoft.com/en-us/azure/active-directory-b2c/service-limits |
| Monitor and manage Azure AD B2C directory size quota | https://learn.microsoft.com/en-us/azure/active-directory-b2c/tenant-management-directory-quota |
| Understand Azure AD B2C token types, contents, and constraints | https://learn.microsoft.com/en-us/azure/active-directory-b2c/tokens-overview |
| Create Azure AD B2C tenant and understand tenant limits | https://learn.microsoft.com/en-us/azure/active-directory-b2c/tutorial-create-tenant |
Security
Configuration
Integrations & Coding Patterns
Deployment
| Topic | URL |
|---|---|
| Deploy Azure AD B2C custom policies with Azure Pipelines | https://learn.microsoft.com/en-us/azure/active-directory-b2c/deploy-custom-policies-devops |
| Deploy Azure AD B2C custom policies with GitHub Actions | https://learn.microsoft.com/en-us/azure/active-directory-b2c/deploy-custom-policies-github-action |
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