Hello @forsubscription,
There is no need to use an Iterator you have a specific operation to iterate.
After your Airtable(Search Records) directly use the Text aggregator module.
Just make sure you use the Airtable(Search Records) as Source Module.
Then do other settings on Text aggregator.
This approach also saves you lots of operations. 
P.S.: Always search first, Check Make Academy. If this is helpful, mark it as a solution and 
Need expert help or have questions? Contact or comment below! 