Call to AAD secured azure function not working from SPFX web part

Copper Contributor

We had tested calling an AAD secured azure function from spfx webpart using “SharePoint Online authentication cookie” approach detailed in the official documentation here

The steps described in the documentation are correctly followed and this method worked for us 3 weeks ago as the response received from AAD was with status 200 and the call was successful.


Since Friday however it seems that there has been a change on the authentication flow and now the azure function call receives a response code 302 , which is rejected by the browser as per the CORS specs. With following message


Failed to load <function URL>: Response for preflight is invalid (redirect)


Has anyone faced this,any ideas to solve?

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