Hello @paul.wheeler,
Please refer to API Compatibility Matrix, second tab. JSFC 3.5.6 is in active obsolescence. At a minimum, would need to migrate to 3.6 to be on a supported version.
However, would suggest to consider migrating to RTSDK, EMA Java, in a planned manner to be on an ease of use, but new API with all the latest features, including the direct integration with RRTO.