Automatic registration failed. Failed to lookup the registration service information from Active Directory. Exit code: Unknown HResult Error code: 0x801c001d
![microsoft office 365 - AADSTS90019 when attempting automatic Azure AD registration of domain-joined Windows 10 device - Server Fault microsoft office 365 - AADSTS90019 when attempting automatic Azure AD registration of domain-joined Windows 10 device - Server Fault](https://i.stack.imgur.com/YfDV5.jpg)
microsoft office 365 - AADSTS90019 when attempting automatic Azure AD registration of domain-joined Windows 10 device - Server Fault
![Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves](https://ulyssesneves.com/wp-content/uploads/2022/06/image-13-1024x631.png)
Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves
![Automatic registration failed at join phase. Exit code: Unknown HResult Error code: 0x80072f78 - Microsoft Q&A Automatic registration failed at join phase. Exit code: Unknown HResult Error code: 0x80072f78 - Microsoft Q&A](https://learn.microsoft.com/api/attachments/270401-image.png?platform=QnA)
Automatic registration failed at join phase. Exit code: Unknown HResult Error code: 0x80072f78 - Microsoft Q&A
![Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves](https://ulyssesneves.com/wp-content/uploads/2022/06/image-10-1024x639.png)
Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves
![Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves](https://ulyssesneves.com/wp-content/uploads/2022/06/image-11-1024x639.png)
Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves
![Azure AD Hybrid Device Join – Troubleshooting error code 0x80070005 during ' Join' phase – Ulysses Neves Azure AD Hybrid Device Join – Troubleshooting error code 0x80070005 during ' Join' phase – Ulysses Neves](https://ulyssesneves.com/wp-content/uploads/2022/06/image-15.png)
Azure AD Hybrid Device Join – Troubleshooting error code 0x80070005 during ' Join' phase – Ulysses Neves
![Gerry Hampson Device Management: Implementing hybrid AAD join over a VPN - the userCertificate attribute saga Gerry Hampson Device Management: Implementing hybrid AAD join over a VPN - the userCertificate attribute saga](https://1.bp.blogspot.com/-x5-T_IaFXjI/YFtOoBRkuAI/AAAAAAAAIxk/UF8VKvYGfzoXLO2byQqwtEdp7TgbIxxCwCLcBGAsYHQ/s653/8.png)
Gerry Hampson Device Management: Implementing hybrid AAD join over a VPN - the userCertificate attribute saga
![Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves](https://ulyssesneves.com/wp-content/uploads/2022/06/image-12-1024x794.png)
Azure AD Hybrid Device Join – Troubleshooting error code 0x801c0021 during the 'discover' phase – Ulysses Neves
![microsoft office 365 - AADSTS90019 when attempting automatic Azure AD registration of domain-joined Windows 10 device - Server Fault microsoft office 365 - AADSTS90019 when attempting automatic Azure AD registration of domain-joined Windows 10 device - Server Fault](https://i.stack.imgur.com/1WuBZ.jpg)
microsoft office 365 - AADSTS90019 when attempting automatic Azure AD registration of domain-joined Windows 10 device - Server Fault
![How to configure Hybrid Azure AD Join without ADFS for Office 365 and Co-Management Activities– Part 2 – All about Microsoft Endpoint Manager How to configure Hybrid Azure AD Join without ADFS for Office 365 and Co-Management Activities– Part 2 – All about Microsoft Endpoint Manager](https://i0.wp.com/eskonr.com/wp-content/uploads/2018/09/image_thumb45.png)
How to configure Hybrid Azure AD Join without ADFS for Office 365 and Co-Management Activities– Part 2 – All about Microsoft Endpoint Manager
![Unable to Hybrid Join AD. the error is automatic registration failed at authentication phase. Unable to acquire access token. - Microsoft Q&A Unable to Hybrid Join AD. the error is automatic registration failed at authentication phase. Unable to acquire access token. - Microsoft Q&A](https://learn.microsoft.com/api/attachments/20721-dsregcmd.png?platform=QnA)
Unable to Hybrid Join AD. the error is automatic registration failed at authentication phase. Unable to acquire access token. - Microsoft Q&A
![Azure AD Hybrid Device Join – Troubleshooting error code 0x80070005 during ' Join' phase – Ulysses Neves Azure AD Hybrid Device Join – Troubleshooting error code 0x80070005 during ' Join' phase – Ulysses Neves](https://ulyssesneves.com/wp-content/uploads/2022/06/image-16.png)