While on the Converse Desk, ECD or on a conversation View, the user is unable to view incoming messages.
•The lookup field is not populated on the incoming SMS record.
•The object field is not populated on the conversation record.
•Previous message field on SMS History was not populated.
•The SMS was received from an unknown number
•Sharing settings is not configured correctly
Follow the given procedure to resolve the issue:
1.Verify and assign appropriate permissions for the user.
2.Index the the Mobile field on the SMS History record if it is not indexed.
3.Populate the object type field on the conversation record, if required.
4.Review the Sharing settings/sharing rules on Conversations object that does not allow messages to be visible to specific people and grant access to the affected user.