Could it be something little?
What TYPE of Office form...Access, Word, Infopath, etc?
In your code, is the name of the subform "Acc_Subform"?
Forms![Accounting_Form_AZ]![Acc_Subform]![Accounting_AZ_FC]
In the code you found online:
Forms![MainFormName].[SubformName].Value
There is a dot "." after the mainformName, not an exclamation point "!".
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