In JIRA, a custom field can be limited by context (i.e., the field is only available for specific projects or issue types):
If the field’s context does not include the relevant project or issue type, the Activity Timeline app cannot map the custom field automatically.
How to fix:
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Go to JIRA Settings → Issues → Custom Fields
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Find the custom field causing the issue and click “Contexts”
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In the context configuration:
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Edit the context to include the relevant project(s) and issue type(s)
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Save the changes
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After updating the context, the field will become available for auto-mapping in the Activity Timeline.