There are several common reasons why you might see these discrepancies:
1. If "Allow Duplicates" is turned off in SmartLead, duplicate leads won't be added or updated to campaigns.
2. If the leads are already blocked in your SmartLead account, they won't be processed.
3. If you've reached your account's lead limit in SmartLead, no new leads can be added until the limits are increased or adjusted.
To resolve this, you should:
** Check if the lead is blocked in your account
** Verify your lead limit status
* Check your "Allow Duplicates" settings
These factors can cause the "Could not add Lead" message while still showing "Existing lead updated" in Clay.