Is JIRA Mobile Connect still supported, attempting to migrate from server version

Hi, I noticed that there is a setting to enable JMC within the project settings summary, which
I’ve enabled, and updated the configuration details in our iOS app.

When attempting to create an issue, the following error is returned.

<JMCTransportOperation: 0x140814c50> Request FAILED & queued item is not deleted. jmc-CCEF107F-A519-492F-81C4-62974BD433DD An unknown exception occurred executing Validator com.atlassian.jira.workflow.SkippableValidator@73da1914

Is anyone successfully using JMC or can offer some guidance to getting it setup correctly.