It is compatible with Openfire 3.9.1 and newer versions. I suggest first upgrade one or two and check if evrything is fine. 2.7.0 has some changes comparing to 2.6.3. This is some of them: https://igniterealtime.org/issues/issues/?jql=project%20%3D%20SPARK%20AND%20reso lution%20%3D%20Fixed%20AND%20fixVersion%20%3D%202.7.0%20ORDER%20BY%20status%20DE SC%2C%20priority%20DESC
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