Append Items to Collection: Value cannot be null. (Parameter 'Collection')

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Hi @darshan93shastri

Can you try the below

The image depicts a visual workflow sequence in a development environment that collects a user input, creates a list, appends the input to the list in a loop, increments a counter, and finally displays the list in a message box. (Captioned by AI)
The image depicts a visual workflow sequence in a development environment that collects a user input, creates a list, appends the input to the list in a loop, increments a counter, and finally displays the list in a message box. (Captioned by AI)818×1181 53.6 KB

This image shows a list of variables in a software interface, detailing their names, variable types, scopes, and default values. (Captioned by AI)
This image shows a list of variables in a software interface, detailing their names, variable types, scopes, and default values. (Captioned by AI)1078×332 13.9 KB

String.Join(", ",TicketContainer)

Sequence15.xaml (15.5 KB)

Regards,