I've never been in a situation in either a full time or contract role where my lack of expertise with a given Project Management software tool was a barrier to landing the gig.
I always consider such knowledge "nice to have" as even if you know the tool, the organization's specific configuration or practices will differ from what you've experienced before.
PMI does not advocate any specific tools or products as there is no "one size fits all" Project Management tool other than a pencil...
Hope this helps!
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