Unable to Pull Changes?

I’ve made a collection in my workspace, and have forked it to our team workspace (free). Changes have been made in my workspace, so I’ve right clicked on the collection and clicked merge.

Postman warns me that the destination collection has changed, and that I should pull changes first. I click pull changes, can see all the changes it will make, however the Pull Changes button is greyed out.

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Any ideas where I am going wrong?