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The "unsupportedgranttype" type error occurs when the requested grant type is not supported by the OAuth2 Server Java Spring. In the case of the JWT_BEARER strategy, it means that the server does not have adequate support for handling JWT (JSON Web Token) authentication requests. This error message is returned to the client when the server receives an authentication request with an unsupported grant type, and the client should modify the request accordingly or switch to a supported grant type.