I believe you have an issue with the following lines -
"def smpTask = customFieldManager.getCustomFieldObjectByName("SMP Task")" and "if (supportTicketCategory.name == "Access")"
It should be "def smpTaskField", since you are using "smpTaskField" in your setRequired/setHidden lines at the end of your codes. Lastly, "supportTicketCategory.name" should be "supportTicketCategory.getValue()" and not ".name".
Hope this helps.
Best, Joseph Chung Yin
Jira/JSM Functional Lead, Global Infrastructure Applications Team
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