iOS Failed to invite some participants

Running iOS client sip invitation staff reported the error, the error is as follows: please help to see, thank you!

2019-06-13 17:38:25.701 [error][tid:com.facebook.react.JavaScript] ‘[__filename]’, ': ', ‘Error inviting phone number:’, ''

2019-06-13 17:38:25.701536+0800 JitsiApp[488:68358] ‘[__filename]’, ': ', ‘Error inviting phone number:’, ''

2019-06-13 17:38:25.725 [error][tid:com.facebook.react.JavaScript] ‘[__filename]’, ': ', ‘1 invites failed’, { phone: 1 }

2019-06-13 17:38:25.725244+0800 JitsiApp[488:68358] ‘[__filename]’, ': ', ‘1 invites failed’, { phone: 1 }

If this is for meet.jit.si check Failed to add members