Generally, this happens when a location/location group attached to the campaign was updated a few minutes before the campaign scheduled time. Due to this, the data is not synced with snowflake and the campaign processed with 0 guests.
As of now, the campaigns are running through Snowflakes and it takes around 30 minutes to sync the DB with snowflakes. It is recommended that when a location/location group is attached to the campaign, it should not be edited in the 30-minute duration before the campaign scheduled time.
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