I am pretty sure that the contacts timeline feature used to be part of the Advanced plan. I know I used to use it or something very similar. Did this drop from Advanced and now is only available on the higher-tiered plans?
@Brandon Wood_1990 it does look like this is now a Professional Plan feature.
It won't be perfect, but have you thought about using filters to get a list of contacts who have/haven't been contacted in a certain timeframe? For example:
Hope that helps somewhat! If you would like additional support, feel free to reach out.
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