We've been using Openfire 4.0.1 for some time now, and we're starting to see an issue with Spark (both 2.7.5 and 2.7.6, in Windows/Linux/Mac) where any attempts to use OTR encryption fails/times out. The recipient simply receives a message that says "?OTRv2?". This was working previously, but at some point has stopped working wihtin the last week or so.
Any and all insight/help would be much appreciated.