A VBA script creates a table with checkboxes. Grouping of the table is not possible.

Copilot has created a VBA script for me that creates a table with several checkboxes. The table has 5 checkboxes next to each other and 17 checkboxes below each other.

Several attempts to group this table failed.
Copilot could not help me either and referred me to Microsoft support.

Does anyone have any idea where the problem lies?

My Office version: Microsoft 365 MSO (Version 2406 Build 16.0.17630.20000) 64 Bit (BETA)