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Matrix 1.17 requires servers that don't support the legacy authentication API to reject `m.login.application_service` on `/login` with a 400 and the `M_APPSERVICE_LOGIN_UNSUPPORTED` error code. Previously this login type fell through the generic unsupported credentials path and returned `M_UNKNOWN`, which appservices written against Matrix 1.17 can't distinguish from an unrelated failure.
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About Application Services login
Encrypted Application Services/Bridges currently leverage the m.login.application_service login type to create devices for users.
This API is not available in the Matrix Authentication Service: as per Matrix 1.19, calling /login with this login type returns a 400 HTTP status code with an M_APPSERVICE_LOGIN_UNSUPPORTED error code.
We're working on a solution to support this use case, but in the meantime, this means encrypted bridges will not work with the Matrix Authentication Service. A workaround is to disable E2EE support in your bridge setup.