Unable to authenticate through sharepoint using M365 account or AppID&Appsecret by C# code.

Question

I'm trying to performing CRUD operations to the list in sharepoint using C # code, but I have encountered two issues and cannot find a valid reference document online. Can someone give me some suggestions or reference links? Thank you in advance. 1>.Microsoft.SharePoint.Client.IdcrlException: The sign-in name or password does not match one in the Microsoft account system.

in this case,it seems that this error was caused by us turning on MFA authentication, but after I asked the AZURE administrator to turn off MFA authentication for my account, I still encounter this error.

2>.Microsoft.SharePoint.Client.ServerUnauthorizedAccessException: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
in this case,i'm the creater of the target sharepoint,why my access was denied?do I need to make any settings for my site or ask administrator make any change for our sharepoint policies?

Answer 1

Hi @Hachi Liu 刘帅

For user name and password login, please clear the cache of the browser and log in the site with the account to check the password and MFA is disabled. If MFA is disabled, you could try to change the password of the user.

For the client id and secret login, you are used a tenant scope app create the site. If you want to access the site, you will need to register a new app which is sitecollection scope.

Please refer to the following document

https://learn.microsoft.com/en-us/sharepoint/dev/sp-add-ins/add-in-permissions-in-sharepoint#types-of-add-in-permissions-and-permission-scopes

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