How to bypass Oauth 2.0 Authorization popup for graph API?

Question

I'm encountering a significant hurdle while attempting to obtain a bearer token for my application, which relies solely on delegated permissions. Whenever I initiate the process to acquire a bearer token, a popup prompts me to enter a username and password, which then generates the bearer token.

Is there a viable method to bypass this popup and directly acquire the bearer token? I'm exploring solutions using Java or Python. Because I need to write automation scripts for the same so this is the only problem we are facing. Any guidance or suggestions to resolve this issue would be greatly appreciated.

Thank you in advance for your assistance!

Answer 1

Hi @Suraj Dengale

Thanks for visiting our forum. Microsoft Teams tag is mainly focused on the general issue of Microsoft Teams application troubleshooting. Based on your description, this problem is related to Microsoft Graph, which we do not support.

The following is for informational purposes only:

https://stackoverflow.com/questions/49154424/how-can-i-bypass-the-oauth2-authentication-with-predefined-tokens-in-spring-boot

Hope the above information is helpful for you!

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Answer 2

Hello, the following block is assuming your priority is automation.

you are looking to bypass multifactor Authentication, which is the main reason why I recommend Using a System Identity with Application Level Permissions. Depending on what resource you are trying to access, it is not necessary to grant the Full graph API Scopes but you can use more Granular Permissions instead. (For Example: Exchange has RBAC for Applications, Entra ID has Custom Roles and Teams has Resource Specific Consent, ...)

I do not understand why you think having a user account, which is not built for application use, where knowing the username and password would give access to the resources you use with your application, is safer than having an application with these permissions, where you could use a certificate as the authentication method, or you have equivalent security with appID + secret.

If you MUST use a useraccount (which again: I do not recommend, since the authentication Protocols are weakened, you are opening yourself to password spray and bruteforcing of a commonly known endpoint)

you would have to
1: Change Conditional Access so that this one Specific User Account is not forced to use MFA
2: If you are not using a klick robot script that can navigate the interactive Logon you would have to implement the ROPC Authentication flow - this would mean that your application would temporarily hold the password of the signed in user anyways and that password would have to be stored somewhere

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If, on the other hand, you have an Application that is meant to be used by humans - the popUp is a security measure that is not to be bypassed.