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Cannot read property 'methods' of undefined

Hi

I’ve started to receive this error:
Cannot read property 'methods' of undefined
when using the Auth0 C# AuthenticationAPI.

It occurs when I try to exchange a refresh token for a new access token.

I can’t find any documentation regarding what this error means, anyone got some suggestions?

That message is a typical Javascript error message so first thing to check would be if you have custom rules enabled in your tenant. Given rules execute as part of a refresh token exchange a problem in rules could be leading to such an error.